Authorities investigating the death of actor Philip Seymour Hoffman found more than 50 glassine-type bags containing what is believed to be heroin in his apartment, two law enforcement sources familiar with the investigation said today.

Investigators also found several bottles of prescription drugs and more than 20 used syringes in a plastic cup, the sources said.

The Oscar-winning actor was found dead in his Manhattan apartment Sunday with a needle in his left arm, law enforcement sources said. He was 46.