Gossip website TMZ reported: "We're told 8 Drug Enforcement Agency vehicles arrived at his offices. Two LAPD detectives also arrived on scene along with uniformed members of the Houston Police Department and 10 members of the DEA's Tactical Diversion Team. There are another dozen or so DEA agents on hand."

Reports claim the LAPD asked the DEA to attend to help serve the search warrant on the Armstrong Medical Clinic.

Murray was in Nevada at the time of the raid.

Yesterday (21.07.09), Chernoff took to his website to speak about the reasons police wanted to look at Jackson's medical records.

He wrote: "The coroner wants to clear up the cause of death, we share that goal. We don't have access to the most important information in this case... the toxicology report. We're still in the dark like everybody else.

"Based on Dr. Murray's minute-by-minute and item-by-item description of Michael Jackson's last days, he should not be a target of criminal charges. Dr. Murray was the last doctor standing when Michael Jackson died and it seems all the fury is directed toward him."

Murray attempted to revive Jackson when he found him unconscious at his rented Los Angeles house last month, unsuccessfully performing CPR (cardiopulmonary resuscitation).