Whitney Houston probably died as the result of a lethal combination of prescription drugs and alcohol, a law enforcement official said Monday.

An investigation into the singer's death is ongoing, but the official, who declined to be identified by name, spoke to FoxNews.com about what appears to have been the cause. Houston, 48, was found dead Saturday in her hotel room in Beverly Hills, Calif.

It looks like it was a lethal combination of prescription drugs and alcohol, but it's still too early to rule out other causes. That's just what it's looking like now, the official told the news website.

The official said bottles of various prescription drugs, including anti-anxiety medication, were found in Houston's room at the Beverly Hilton.

Beverly Hills police confirmed Monday that a member of Houston's staff found the star unconscious in the bathtub of her hotel room Saturday afternoon, then pulled her body out of the water, according to CBS News.

The police depatment said its preliminary investigation was over, but it wouldn't comment further about details of the scene, the body or other matters. It said no more information will be forthcoming until the Los Angeles County coroner's office finishes its investigation, FoxNews.com reported, and that officials may look into where the singer got the prescription drugs found in the hotel room.

An official determination of what caused Houston's death may be eight weeks off.

There will be no cause of death at this time, as it is awaiting toxicology testing, Deputy Coroner Ed Winter said Sunday. I know there were reports of did she drown or was it an overdose, but I will not be commenting on that.

In a prepared statement, Houston's family said: We are devastated by the loss of our beloved Whitney. This is an unimaginable tragedy, and we will miss her terribly.