Police and anti-drug authorities have searched the clinic of Michael Jackson's doctor for evidence of manslaughter.
Officials from the Drug Enforcement Administration executed a warrant at Dr Conrad Murray's offices in Houston, Texas.
The Los Angeles Police Department and local police were also involved in the search at the Armstrong Medical Clinic.
Dr Murray's lawyer Ed Chernoff confirmed the warrant authorised the agencies to seize items they believed were evidence of manslaughter.
He said: "The search was conducted by members of the DEA, two robbery-homicide detectives from the Los Angeles Police Department and Houston Police officers.
"The search warrant authorised law enforcement to search for and seize items, including documents, they believed constituted evidence of the offence of manslaughter."
Mr Chernoff said the investigators left with a "forensic image" of a computer hard drive and 21 documents.
He added: "None of the documents taken had previously been requested by law enforcement or the LA Coroner's office. "
DEA spokeswoman Violet Szeleczky denied that the activity at the clinic was a raid.
She said: "What this is is the LAPD have an investigation and they came to the DEA ... and they asked us to help them effect a state search warrant here."
Mr Chernoff confirmed on Tuesday that investigators had asked for additional medical records and more information from Dr Murray.
The doctor, who was the King of Pop's personal physician, has been interviewed by police twice but has not been considered a suspect in the singer's death.
His legal team confirmed a third interview was being arranged.
In a separate development, officials launched an investigation into the memorial held for Jackson after possible "criminal activity" over the event's costs.
LA city attorney Carmen Trutanich is looking into expenditure on the service after $1.4m (£850,000) of taxpayers' money was spent on policing.
It comes amid a public outcry over the memorial's expenses, in particular a $48,000 (£29,000) bill on sandwiches for police officers.
"Our investigation has taken an unanticipated turn that raises both civil and criminal aspects," Mr Trutanich told the city council.
He said he could not reveal any further details about the possible criminal activity.
Thousands of officers were drafted in to provide security and control crowds for the star-studded event at the Staples Centre on July 7.
The LAPD estimated as many as 250,000 people would descend on the area but in the end only around 1,000 fans turned up without tickets.
