Detectives are now linking a number of rapes and sexual assaults on women in east London.
A 35-year-old woman was raped as she walked home along a residential street in Plaistow South on Monday, July 1, at 2:40am. The man who attacked her also stole some of her possessions
Five days later, on Saturday, July 6, at 3:35am a woman was followed by a man. He robbed her and made sexual advance towards her.
Less than an hour later, at 4:20am, a 31-year-old woman was raped as she walked home along Amethyst Road in Leyton.
In a fourth attack on Thursday, July 11, a 31-year-old woman was followed by a man who threatened her and then tried to rape her at 3:30am on Central Park Road in East Ham.
The image of the man police want to speak to was captured on a bus in Plaistow shortly before the first incident.
Detective Superintendent Andrew Packer said: