MINNEAPOLIS (CBSNewYork/AP) —  Several pills taken from Prince’s estate in Paisley Park after his death were counterfeit drugs that actually contained the powerful opioid fentanyl, an official close to the investigation told the Associated Press.

He said many of the pills were found inside aspirin and vitamin bottles tucked in a suitcase, in duffel bags and in a dressing room.

The official spoke on condition of anonymity because of the ongoing investigation.

Autopsy results released in June show Prince died April 21 of a fentanyl overdose. The official who spoke to the AP said records show Prince had no prescription for any controlled substances in the state of Minnesota in the 12 months before he died.

Tests on Prince prior to his death did not show fentanyl in his system, which means he wasn’t a long-time abuser of that drug, but likely took the fatal dose sometime in the 24 hours before he died, the official said.

Authorities are still investigating how Prince obtained the drugs.

The autopsy report also shows Prince had diazepam, lidocaine and hydrocodone acids in his body, the official said. Diazepam is an anti-anxiety pill sold as Valium. It’s a sedative and can also be used to control seizures, which Prince suffered from as a child. Lidocaine is a local anesthetic.

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