MINNEAPOLIS (AP) - Several news organizations are reporting that prescription drugs were discovered with Prince when he was found dead in his Paisley Park home.

ABC, NBC, CBS, and CNN, citing unidentified law enforcement sources, have reported that prescription painkillers were found on the 57-year-old Prince and in his home. The Star Tribune, also citing unnamed sources, reported that prescription pills were found but that it wasn't clear whether they were prescribed to Prince.

Prince died April 21. Autopsy results aren't expected for three to four weeks.

Several outlets also reported Minnesota investigators have asked the U.S. Drug Enforcement Administration for help.

Carver County Deputy Sheriff Jason Kamerud discounted those reports late Wednesday, saying the DEA "is not part of the investigation at this time." A DEA spokesman in Chicago hasn't responded to messages.

UPDATE 11:40 a.m. -

A Minnesota judge has sealed a search warrant in the investigation of Prince's death after authorities argued that making it public would hamper their work.

The search warrant is for Paisley Park, the musician's home and recording studio complex in suburban Minneapolis. Prince died at the complex on April 21, and the search was carried out that day.

The local sheriff and prosecutor filed papers Thursday requesting it be sealed. They cited the intense media scrutiny following Prince's death.

The singer was found unresponsive in an elevator at Paisley Park, and was soon pronounced dead. No cause of death has been determined, and results from an autopsy aren't expected for three to four weeks.