A 16-year-old boy has been arrested on suspicion of rape following an alleged attack at a care home for the elderly.
The teenager was said to have broken into New Thursby Nursing Home in Lytham St Annes, close to Blackpool, shortly before 5am on Sunday.
He reportedly climbed through a ground floor window dressed in black.
The assault was interrupted when a member of staff entered the room and the attacker fled through the same window that he had used to gain access to the building.
The boy, who is from Blackpool, has been arrested on suspicion of rape and burglary. He remains in police custody.
Detective Inspector Jamie Lillystone, of Blackpool Police, said: "First and foremost our thoughts remain with the victim and their family, who are being cared for by professionals and being supported by specialist officers.
"We have had a team of officers working tirelessly on this investigation since Sunday, and we have today made an arrest.
"However, our investigation is very much ongoing and we are continuing to appeal for information.
"If you know anything at all that could help with our enquiries, we need to hear from you.
"If you were in the area at around 5am on Sunday and saw anything suspicious, or have any CCTV or dash cam footage that may be useful, please contact us."
Officers have also been urging people to secure their windows and doors following the attack.
Anyone with information should contact police on 101, quoting log number 350 of 4th August.