Las Vegas police searched the home of Dr. Conrad Murray, Michael Jackson's personal doctor, on Tuesday as the probe into the star's sudden death increasingly appeared to focus on whether the physician gave him drugs before he died.

A spokesman for the U.S. Drug Enforcement Agency and Los Angeles police said DEA agents, Las Vegas police and Los Angeles detectives entered Murray's home and office early on Tuesday morning.

DEA spokesman Jose Martinez declined to say specifically what agents were looking for, but numerous media reports have said that the probe into the cause of the Thriller singer's sudden death on June 25 has focused on Jackson's use of the powerful anesthetic propofol, also known as Diprivan, to sleep.

Investigators have questioned and searched the offices of other doctors who treated Jackson over the years, but last Wednesday federal agents and Los Angeles police raided Murray's office in Houston.

At the time, Murray's lawyer said they were looking for evidence of the offense of manslaughter. The attorney, Ed Chernoff, could not immediately be reached for comment on Tuesday.

Murray was Jackson's personal physician in the weeks before he died of cardiac arrest, and Murray was at his bedside trying to revive the pop star before he was taken to a Los Angeles hospital where he was pronounced dead.

Los Angeles coroners have said they expect to issue a report into the cause of Jackson's death as soon as this week following toxicology reports.