"Are we dealing with homicide? Are we dealing with an accidental overdose? What are we dealing with? So as we are standing here speaking, I can tell you, I don't have that information," the New York Daily News quoted Police Chief Bill Bratton as having said on CNN on Thursday night.

His comments came at a time when Jackson’s father, Joe, revealed his own suspicions about his son's death.

"I do believe it was foul play," Jackson told ABC News' "Nightline".

Bratton said that the probe into the ‘Thriller’ star’s death might lead to the framing of criminal charges, based on "corroboration from the coroner's office as to the cause of death."

Five doctors, who had treated Jackson in the past, are being investigated to determine whether they supplied the singer with the powerful sedative Diprivan.

Bratton said that the federal Drug Enforcement Agency and the State Attorney General's office, which keeps a database of prescription drugs, were assisting.