A 14-year-old girl was raped in a south-east London park in broad daylight.
The teenager was attacked in a secluded area in Avery Hill Park, off Avery Hill Road, in Greenwich.
The Metropolitan Police said the assault happened between 9am and 1pm on Monday September 4.
Officers have released images of a man they would like to speak to in connection with the incident.
A spokesman said: "The attacker is described as a black male believed to be in his 20s, of slim build, with short black hair and a moustache.
"He was wearing sand-coloured combat trousers, dark shoes which might have been blue, and a grey drawstring bag.
"He was also wearing sunglasses with black, round lenses."
Police said the victim was being supported by specialist officers and said no arrests had been made.
DC Mark Azariah, from the Child Abuse and Sexual Offences Command, said: "This was a horrendous attack on a vulnerable girl in the middle of the day.
"If you were in and around the area and saw anyone matching the description of the suspect or saw anything suspicious I would urge you to get in touch.
"Likewise, if you have information about the man wanted for questioning as a result of the images released today, my team are waiting for your call."
Any witnesses or anyone with information should call police on 07789 926065 or email firstname.lastname@example.org.