POLICE are investigating a complaint that a man broke into a house in Bradford and committed a sexual act over the bed of a sleeping couple.
Officers were called to a property in Eccleshill and took a sample of the bedding to check for DNA.
The incident is alleged to have happened overnight.
A West Yorkshire Police spokesman said: "Police were called at 10.13am yesterday to an address in the BD2 area after a report of a suspicious incident.
"Officers did not find any signs of forced entry into the property and a piece of material has been recovered.
"Police have not been made aware of any similar incidents in the BD2 area recently and enquiries are continuing."