Mystery surrounds the death of a baby girl whose breathing sounded like a "police siren''.

Bradford Coroner's Court heard how Chloe Chapman was placed in bed between her parents at their home in Highfield Road, Keighley, one morning last November.

But her lips later turned blue and she stopped moving. Efforts were made to resuscitate her before an ambulance arrived.

Staff managed to revive her at Airedale Hospital, Eastburn, before she was transferred to Leeds General Infirmary. But the five-and-a-half-week- old baby was declared brain dead the next day.

After talking to doctors, her parents, Graham and Kelly Chapman, decided that her life support machine should be switched off.

A post-mortem examination revealed she suffered brain damage but medical experts could not say why she collapsed or how her death occurred.

In a statement read to the hearing, Mr Chapman said he was watching TV in his bed as he held Chloe on his right arm.

But he was woken later by his daughter making a "whirring'' sound like a police siren.

When he checked on her, he discovered she was not moving and her lips had turned blue.

Mr Chapman tried to resuscitate her and screamed for an ambulance. His sister attempted to revive her in the living room before the ambulance turned up.

Coroner Roger Whittaker said there was no evidence in this "sad and tragic'' case that "co-sleeping'' was the cause of her death. But he stressed he continued to maintain that the practice was extremely dangerous.

He recorded an open verdict.