Chief Detective Inspector Neil John of the Met’s Specialist Crime Command said a “massive trawl” of CCTV in the area continued, and information on the man’s identity and location could be “essential” for the investigation.
Assistant Commissioner Louisa Rolfe said: “Anyone who knows who he is, or if you have seen these images and have even minimal information, please contact us.”
Last night, Miss Nessa’s family expressed their immense grief in a statement released by her sister, Jebina Yasmin Islam.
She said: “As a family, we are shocked at the murder of our sister, daughter and aunt to my daughters.
“There are no words to describe how we feel as a family right now. We didn’t expect something like this to happen to us one day.
“I urge everyone to walk the busy streets on their way home from work, school or friends’ homes. Please stay safe. May Allah grant them Heaven.”
The Telegraph previously revealed that Miss Nessa was attacked as she left her apartment building around 8:30 p.m. last Friday night on her way to a friend’s house in a bar just a five-minute walk away.
Grainy CCTV footage taken outside the block would show her blowing herself up as she left her apartment building.
A police source said the assailant could be seen hitting her on the head with a gun before taking her over her shoulder towards Cator Park.
A dog walker found her body near the OneSpace Community Center in the park on Saturday around 5:30 p.m.