A 17-year-old girl was dragged into a park and raped in a "frightening attack" in Brighton.
The girl was was grabbed from behind at about 0130 GMT while walking up Dyke Road, near the Booth Museum, said Sussex police.
The offender forced her across the road to a nearby park and raped her.
Detectives said the area near the tennis courts in Dyke Road Park had been cordoned off and officers were carrying out extra patrols.
'Victim receiving help'
The suspect was described as being olive skinned, aged in his 30s, with short dark hair and a stocky build.
He had sideburns and spoke with either a French or Italian accent.
Det Insp Steve Warner said: "This was a frightening attack on a woman walking home after a night out.
"The victim is with specially-trained officers and receiving help and support."
He added: "We have cordoned off the area while forensic examinations are carried out and patrols of the area have been increased.
"Attacks of this nature are rare but I would like to remind women to take personal safety advice and be vigilant when walking alone, especially at night."