It is believed the doctor was at 50-year-old Jackson's house when he died last month, BBC reported

Michael Jackson's personal doctor has been identified as the target of a manslaughter investigation into the singer's death, US court papers say.

Dr Conrad Murray's medical clinic in Houston, Texas, and another site rented by him were searched on Wednesday.

Police have said previously that Dr Murray is not a suspect but the search warrant allowed the authorities to seek evidence of manslaughter.

The doctor was at Jackson's mansion and tried to revive him before he died.

Dr Murray has already been interviewed twice by police, who had asked for medical records in addition to those already provided.

According to the warrant, approved by a Houston judge and filed in Harris County District Court, authorities were looking for "items constituting evidence of the offence of manslaughter that tend to show that Dr Conrad Murray committed the said criminal offence".