Detectives have also released images of a man they want to speak to and a vehicle they are searching for
A 38-year-old man has been arrested on suspicion of the murder of teacher
Sabina Nessa, the Metropolitan police said.
The 28-year-old is suspected to have been murdered as she walked through Cator Park in south-east London, on what should have been a five-minute journey to a pub from her nearby home, at about 8.30pm last Friday.