LAS VEGAS, Nevada (CNN) -- Investigators searched the Las Vegas home and office of Michael Jackson's personal physician, Dr. Conrad Murray, Tuesday morning, a Drug Enforcement Administration spokesman said.
Los Angeles police and drug enforcement agents, carrying search warrants, were "looking for a lot of things," said Assistant Special Agent in Charge Mike Flanagan.
Aerial cameras showed investigators leaving Murray's home, three hours after they entered, carrying several containers.
The searches came a day after a source with knowledge of the investigation confirmed to CNN that Murray administered a powerful drug that authorities believe killed the singer.
Flanagan said that while he could not disclose details of the search warrants, because a judge had ordered them sealed, he confirmed they were looking for documents and computer records.
"We're looking for a lot of things," he said.
Murray's attorney, Ed Chernoff, issued a statement saying that officers from DEA, Los Angeles police and "various local agencies" executed a search warrant at Murray's home and office beginning about 8 a.m. (11 a.m. ET) Tuesday.
"The search warrant authorized investigators to look for medical records relating to Michael Jackson and all of his reported aliases," the statement said. "Dr. Murray was present during the search of his home and assisted the officers."
Investigators left Murray's home about noon, he said, taking cell phones and a computer hard drive. "As of 2 p.m., the search at Dr. Murray's office continues," the statement said.
Murray, a Texas-based cardiologist, allegedly gave Jackson the anesthetic propofol -- commonly known by the brand name Diprivan -- in the 24 hours before he died, said the source, who asked not to be named because the individual was not authorized to speak to the news media.
The doctor's attorneys in a statement Monday said they wouldn't comment on "rumors, innuendo or unnamed sources." In the past they have said Murray never prescribed or administered anything that could have killed the pop star.
Last week, Texas authorities searched Murray's Houston medical office and storage unit, looking for "evidence of the offense of manslaughter," according to court documents.
Among the items removed from Murray's office were a computer; 27 tablets of phentermine, a prescription-strength appetite suppressant; a tablet of clonazepam, an anti-anxiety medication; and some Rolodex cards.
From Murray's storage unit, authorities removed two computer hard drives; and "important contact list;" a suspension notice from Houston's Doctor Hospital; notices from the Internal Revenue Service; and a laundry list of medical and hospital documents.
Chernoff, a Houston lawyer hired by Murray soon after Jackson's death, confirmed at the time that Los Angeles Police detectives and federal Drug Enforcement Administration agents used a search warrant to enter Murray's office in northeast Houston Wednesday morning.
Chernoff said members of Murray's legal team were at the medical office during the search, which he said "was conducted by members of the DEA, two robbery-homicide detectives from the Los Angeles Police Department and Houston Police officers."
Police have interviewed Murray twice since Jackson's death. A third interview was scheduled for July 24, but was postponed after the search warrants were executed. It's unknown when the next interview will take place.
Among those who have indicated that Jackson may have been using dangerous prescription medication are a nutritionist -- Cherilyn Lee -- who said Jackson pleaded for the powerful sedative Diprivan despite being told of its harmful effects.
Meanwhile, the Los Angeles County coroner's office continues to investigate the cause of Jackson's death on June 25. It has been waiting on toxicology lab results, but a final autopsy report is expected as soon as this week, a coroner's spokesman has said.