Police are understood to believe the prime suspect in the Sabina Nessa murder is still at large after releasing two men they had arrested for the teacher's killing.
Detectives are urgently appealing for information about a mystery man who was captured on CCTV in Pegler Square, south east London, on the night Sabina, 28, was attacked.
It comes after two men who were arrested in connection with the alleged murder have been released under investigation, the Metropolitan Police confirmed.
The primary school teacher, originally from Bedfordshire, disappeared on September 17 as she left home to meet a man for a first date at a local pub.
Police understand she was attacked in a park at around 8.30pm, with her body being discovered by a member of the public almost 24 hours later near the OneSpace community centre hidden under a pile of leaves.
On the same day, a man in his 40s and known to her was the first to be arrested on suspicion of her murder. He was later released under investigation.
A 38-year-old man who was arrested on Thursday at an address in Lewisham in connection with the murder of has also been released under investigation.
The man in the CCTV footage, who is dressed in casual clothing and appears to be clutching an object in his right hand, was in the area where Nessa was found dead on the night she was attacked, according to police.
A 12-second clip shows a bearded and balding man wearing a black hooded coat and grey jeans looking over his shoulder and pulling at his hood as he walks down Pegler Square in Kidbrooke, south-east London.
Detectives are urgently to appeal for information about a mystery man who was captured on CCTV in Pegler Square, south east London, on the night Sabina Nessa, 28, was attacked
Detectives are urgently to appeal for information about a mystery man who was captured on CCTV in Pegler Square, south east London, on the night Sabina, 28, was attacked
The primary school teacher, originally from Bedfordshire, disappeared on September 17 as she left home to meet a man for a first date. Her body was found in Cator Park on Saturday
Scotland Yard appealed for information on the man shown, and a silver vehicle that was seen in the area, and asked the public to come forward with information
Detectives have also released an image, captured in the same area, of a silver car they believe the man has access to and appealed for anyone who recognised either to contact the force immediately.
Detective chief inspector Neil John, from the Met's Specialist Crime Command, said 'an extensive trawl' of CCTV in the area continued and said information on the man's identity and whereabouts could be 'vital' to the investigation.
DCI John added: 'We want to thank those who have shared our image appeal over the last 24 hours – it has gained a huge amount of coverage and we are extremely grateful for the public's help.
'We are now a week on from Sabina's murder and while we have made good progress with our investigation we must keep this appeal for information going and encourage anyone who has any information to come forward.'
Anyone with information on the man's identity is urged to call the incident room on 0208 721 4266 or Crimestoppers completely anonymously on 0800 555 111.
CCTV believed to be showing the attack, first reported by the Daily Telegraph, sees an assailant apparently striking Sabina on the head with an object moments after she left her house. Detectives have declined to comment on these reports.
Earlier, detectives had speculated whether the attack had been carried out by a stranger and were 'keeping an open mind' on the killer's motive.
Furious campaigners and a handful of MPs have demanded that public spaces be made safer for women in the wake of a string of high-profile murders this year.
Parallels are being drawn to the horrific murder of 33-year-old marketing executive Sarah Everard in March, amid fresh fury that women could not walk through Britain's streets alone without fearing for their lives.
But Detective Chief Superintendent Trevor Lawry insisted the area remains 'safe for women' despite mounting pressure from women's safety campaigners who are urging officers to do more to protect them on Britain's streets.
Meanwhile, a vigil took place in Peglar Square at 7pm yesterday, near to where Sabina's body was found. The vigil was organised by campaign group Reclaim the Streets, which said it is 'angry and heartbroken' about her death.
Meanwhile, a vigil took place in Peglar Square, near to where Sabina's body was found, at 7pm on Friday. Pictured: Jebina Nessa pays tribute to her sister during the vigil
Sister Jebina Nessa broke down in tears as she paid tribute to her sister Sabina, a 28-year-old primary school teacher who was murdered yards from her south east London home
Her sister Jebina (pictured) told the massive crowds: 'We have lost an amazing, caring, beautiful sister, who left this world far too early
People light candles during a vigil in memory of Sabina Nessa, a teacher who was murdered in south east London last Friday
Women hold candles at a vigil for killed primary school teacher Sabina Nessa in Pegler Square, Kidbrooke, in south east London
Sabina left her home on Astell Road after arranging to meet a friend at The Depot bar in Pegler Square, Kidbrooke Village, south-east London, last Friday night but never made it.
Police believe she was attacked in the busy Cator Park at around 8.30pm with her body being found by a member of the public almost 24 hours later near the OneSpace community centre.
No one reported Sabina missing after she failed to make the rendez-vous, said police, but her housemate has now spoken out on the horrifying ordeal and shared her unease.
She told the Guardian: 'I never thought something like this could happen to her. I had been texting her and it's not like her to not reply to my messages.
'I don't feel safe living here now.'
Earlier, detectives had speculated whether the attack had been carried out by a stranger and were 'keeping an open mind' on the killer's motive.
More than 500 campaigners and well-wishers gathered in Pegler Square for a vigil yesterday with supporters arriving on foot, by bicycle and on the train to attend the memorial at the heart at the south London housing estate. Many had brought their young children, others had brought their dogs.
The vigil came as Kate Middleton said she was 'saddened by the loss of another innocent young woman on our streets'.
Dozens lit candles and placed bunches of flowers as they stood around a makeshift stage to honour Sabina.
And Downing Street also joined the vigil, placing a lantern on the front step of the Prime Minister's residence in memory of the killed primary school teacher.
Supporters clapped their hands in a show of solidarity while her friends thanked the hundreds who come together to remember the dynamic young teacher who was allegedly attacked and killed.
Her sister Jebina Yasmin Islam told the crowd: 'We have lost an amazing, caring, beautiful sister, who left this world far too early.
Well-wishers and campaigners shed tears as they gathered for a vigil in memory of killed 28-year-old primary school teacher Sabina Nessa
People light candles during a vigil in memory of Sabina Nessa, a teacher who was murdered in south east London last Friday
Hundreds of mourners and well-wishers gathered in Pegler Square tonight in memory of Sabina Nessa, a 28-year-old primary school teacher killed last week
Supporters clapped their hands in a show of solidarity and held burning candles while her friends thanked the hundreds who come together to remember the dynamic young teacher
Dozens of supporters flocked to Kidbrooke Village to honour the of the 28-year-old Primary school teacher who was murder a week ago today
Well-wishers laid flowers and lit candles around a placard calling to 'end male violence' at a vigil in memory of killed primary school teacher Sabina Nessa
'Words cannot describe how we are feeling, this feels like we are stuck in a bad dream and can't get out of it. Our world is shattered, we are simply lost for words.'
Scotland Yard wanted to avoid a repeat of the disastrous scene earlier this year during a vigil for murder victim Sarah Everard.
Met chiefs were accused of being heavy-handed with female demonstrators at the height of Covid-19 restrictions, when large public gatherings were banned.
Kidbrooke Village residents Roxana Chelaru and husband Ionut told how they no longer feel safe in their home.
Roxana told MailOnline: 'We live two minutes from where this poor young woman was murdered. We walk our dog in the park where she was killed. Sometimes I walk him there at night when it is dark.
'We thought this was a nice place to live with other families. But now I don't feel safe.
'But tonight we want to show solidarity with this poor woman. This should not happen.'
Husband Ionut added: 'It's very sad. Now I am worried about my wife. Often she must walk back from the station alone. After what has happened we don't want to live here anymore.'
Michael Stacey and wife Seychelle brought their six year old daughter Olivia to the vigil because Sabina Nessa was her teacher.
Mr Stacey, 42, a printer told MailOnline: 'I don't know what to say. It's a terrible thing to happen. She was a lovely woman and a great teacher. Olivia loved her. So we're here to pay our respects. It's the least we can do.'
Lisa Williams, the headteacher at Rushey Green Primary School in Lewisham, where Ms Nessa worked, said they are 'devastated' by the teacher's death, Sky News reported.
Dozens lit candles and placed bunches of flowers as they stood around a makeshift stage to honour Sabina
A woman holds her hands together in prayer as well-wishers gather in Pegler Square for a vigil in memory of killed primary school teacher Sabina Nessa
Supporters laid tributes to Sabina Nessa while her friends thanked the hundreds who come together to remember the dynamic young teacher who was attacked and killed
Hundreds of campaigners against violence gathered in Pegler Square with supporters arriving on foot, by bicycle and on the train to attend the memorial at the heart at the south London housing estate
Supporters clapped their hands in a show of solidarity while her friends thanked the hundreds who come together to remember the teacher who was allegedly attacked and killed
She added: 'She was a brilliant teacher; she was kind, caring and absolutely dedicated to her pupils.
'She had so much life ahead of her and so much more to give and her loss is desperately sad.
'As a school we are supporting each other through this very difficult time.'
Jamie Klingler, co-founder of the Reclaim The Streets pressure group, said Londoners had to come together to defend women against violence.
She told MailOnline: 'This has been a terrible tragedy and everyone has been affected by this latest act of violence.
'But the community has come together to stand up against violence to women.'
Eltham MP Clive Efford told Ms Nessa's family: 'With everything that you are going through, these people are here for you.'
He told the crowd that the police 'officers here are also parents and they are just as determined to see justice to Sabina's family as anyone else, I have witnessed that this week.'
He also told those gathered that they will need to go back into their communities to make a difference in the way that women are treated, and the levels of respect given to everyone.
Meanwhile, police declined to comment on reports in the Daily Telegraph that Sabina was hit on the head yards from her home by an assailant wielding a weapon, then slung over his shoulder and dumped in a park in an attack caught on CCTV.
Footage showed Sabina being struck on the head by an assailant wielding a weapon just moments after she left her flat, before she was slung over his shoulder and dumped in a local park, it is claimed.
Sabina's family released a new statement reiterating their shock over her horrifying murder after the further details of the case were reported.
Well-wishers laid flowers and lit candles around a placard calling to 'end male violence' at a vigil in memory of killed primary school teacher Sabina Nessa
Dozens lit candles and placed bunches of flowers as they stood around a makeshift stage to honour Sabina. Supporters clapped their hands in a show of solidarity while her friends thanked the hundreds who come together to remember the dynamic young teacher
Chief Superintendent Trevor Lawry by the floral tributes at Cator Park in Kidbrooke, south London, near to the scene where the body of Ms Nessa was found
The Depot bar in Pegler Square, where Ms Nessa was due to go on a first date last Friday, according to her friend
Sabina's sister Jebina Yasmin Islam said: 'We as a family are shocked of the murder of our sister, daughter and aunty to my girls.
'There are no words to describe how we are feeling as a family at the moment. We did not expect that something like this would ever happen to us.
'I urge everyone to walk on busy streets when walking home from work, school or a friend's homes. Please keep safe.
'I ask you to pray for our sister and make dua (supplication) for her. May Allah grant her paradise.'
Assistant Commissioner Rolfe said the Metropolitan Police is not asking women to change their behaviour when going out at night in light of the murder of Sabina Nessa.
Sabina was taking a five-minute walk to meet a friend at The Depot bar in Pegler Square near her home in Kidbrooke, south-east London, on September 17 at around 8.30pm when she was attacked.
It is believed that she was walking through Cator Park towards The Depot bar on Pegler Square, Kidbrooke Village, where she planned to meet a man for a first date.
Sabina never arrived at the pub and was allegedly murdered as she walked through the park, according to police.
But reports have claimed that Sabina was just minutes from her home when she was attacked near the OneSpace Community Centre in Cator Park at around 8.30pm on Friday, September 17.
A member of the public found her body close to the OneSpace community centre in Cator Park on Saturday at around 5.30pm.
A post-mortem examination was inconclusive and further tests will now be carried out to establish a cause of death.
Anyone with information should call the incident room on 0208 721 4266 or Crimestoppers completely anonymously on 0800 555 111.
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