Police searching for missing Sian O'Callaghan have found her body and are searching for another possible victim, as a man is questioned on suspicion of double murder.
Police said the arrested man had identified the location of two bodies.
Earlier detectives suggested two people had been found, but later confirmed searches are continuing.
Miss O'Callaghan, 22, was last seen leaving Suju nightclub in Swindon on Saturday.
Members of her family have been informed of the discovery of her body and are said to be "deeply distressed".
'Dignity they deserve'
Det Supt Steve Fulcher said: "A 47-year-old man from Swindon is in custody, having been arrested for kidnap and two murders.
"The location of two bodies have been identified to me by this individual, one of whom has yet to be identified formally, but I am quite clear is Sian.
"I have informed Sian's family, who are obviously deeply distressed."
He added: "I want to recover these people and give them the dignity they deserve."