Detectives are questioning a man held on suspicion of murdering his ex-girlfriend and her son with an axe.
The 45-year-old was arrested on Monday morning after the victims’ bodies were discovered in a “horrific” scene at their terrace home in Mold Crescent, Banbury, Oxfordshire.
The victims were named locally as Sally Cox, 43, and Martin Faulkner, 22.
Mrs Cox’s two teenage daughters managed to flee the house. One was badly hurt in the incident and the other, a 13-year-old, was “severely traumatised” but uninjured, police said.
The suspect, who police said was a former partner of Mrs Cox, was arrested by armed police in Wiltshire a few hours later.
Detective Inspector Steve Duffy said: “As you can appreciate, officers went to the address and were faced with a horrific scene. There were two people obviously dead or very close to death at the scene.
“All I can confirm is their injuries are consistent with blunt trauma and I can’t say if an axe was used but a firearm was not used. The police traced a suspect to an address in Wiltshire and police went to that address and effected an arrest.”
Mr Duffy said police had received no previous calls to the address about domestic incidents.
A shocked neighbour of the victims, who did not want to be named, said: “All we’ve heard is there’s been a murder and an axe was involved. I know the house but I don’t know who lives there.”
More than 40 police officers were working on the investigation, as the end-terrace house was cordoned off and a long stretch of the road was closed to traffic and pedestrians in both directions. Police officers were also present at a second house in Mold Crescent, opposite the scene of the attack.