Detectives are investigating a woman's death after her boyfriend was heard banging on neighbours' doors in the early hours shouting: "My girlfriend is dying".

A policeman guards the house in Rymers Lane

Officers were called to a house in Florence Park, Oxford, at 12.20am on June 25 and found a 25-year-old woman lying on the floor with a faint pulse.

Paramedics tried to revive her, but she died a short time later at the John Radcliffe Hospital. Police said her death was suspicious.

Class A drugs and syringes were found at the house in Rymers Lane.

Officers arrested the woman's 25-year-old boyfriend, who lives at the house, on suspicion of supplying drugs. He was not arrested in connection with the death. He was still being questioned today.

A post mortem was due to be carried out on the woman on June 25.

Neighbours said they had heard shouting and screaming in the street soon after midnight.

Mehrdad Parshfar, 37, of Lytton Road, said his friend called police because a man was banging on doors.

"He was knocking on the door and on the neighbours' doors and he said: 'Please somebody help me, my girlfriend is dying'," he said.

"It's very strange. Nothing has happened before at that house."

Flutra Qatja, 36, also of Lytton Road said: "I heard screaming and shouting. I opened the window, but I didn't see anything. I'm very shocked. I thought it was somebody drunk."

Neighbour Mary Pittaway, 72, said: "I heard raised voices first and then loud moaning which went on for a long time, about 10 or 15 minutes. I was in the back bedroom and it woke me, so you get an idea of how loud it was.

"I have lived here 50 years. The road has changed and you don't know who your neighbour is now. All the houses here have got such a lot of people in them."

A 60-year-old man, from Rymers Lane, who asked not to be named, said: "There was a lot of shouting and noise going on after midnight.

"I thought I heard the doorbell, but by the time I had got some clothes on there was nobody there. You could still hear the voices, but I didn't know where they were coming from.

"We have got a lot of rented houses here, so you don't know who lives at an address or who is supposed to live there. You don't build up any sense of community."

Shahid Ahmed, 30, of Rymers Lane, said the occupants of the house had changed frequently in the past few years.

Oxford police spokesman Lucy Ferguson said: "This was the tragic death of a young woman with her whole life ahead of her. We need people to come forward if they know her or know her movements before she died."

Anyone with information should call Oxford police on 01865 266333, or Crimestoppers on 0800 555111.