A 16-year-old boy has been arrested on suspicion of murdering a woman, police said.
The teenager was held after officers attended an address in Benville Road, Weymouth, Dorset, after reports that a woman had been injured.
When police arrived at the property at 1.06pm on Saturday they discovered the woman's body.
Dorset Police said the woman's death was being treated as suspicious and officers - assisted by the force helicopter - searched the surrounding area.
Police also carried out house-to-house inquiries in and around Benville Road and a cordon was been put in place around the property while forensic experts examined the scene.
Detective Inspector Marcus Hester said: "I can confirm that Dorset Police has launched an investigation into the circumstances surrounding the discovery of the deceased woman.
"As a result, members of the public may have noticed increased police activity within the Weymouth area.
"This incident is not connected to the Olympic preparations currently ongoing in Weymouth and Portland."
Mr Hester added: "Even though someone has been arrested, I would still like to speak with anyone who saw anything suspicious or unusual in the Benville Road area between 11am on July 20 and 1pm on July 21."
Police said the woman's relatives have not yet been informed.