MINNEAPOLIS — Investigators are looking into whether Prince died from an overdose and whether a doctor was prescribing him drugs in the weeks before he was found dead at his home in suburban Minneapolis, a law enforcement official told The Associated Press.

The official said Thursday that among the things investigators are looking at is whether a doctor was with Prince on a plane that made an emergency landing in Illinois less than a week before the star died.

The law enforcement official has been briefed on the investigation and spoke to the AP on condition of anonymity.

The official said investigators are also looking into what kind of drugs were on the plane and at Prince’s house in suburban Minneapolis.

The official also confirmed some details that have previously been reported by other media outlets, including TMZ.

Prince’s plane made an emergency stop in Moline, in western Illinois, on April 15 and he was found unconscious on the plane, the official said. The person said first responders gave Prince a shot of Narcan, which is used in suspected opioid overdoses. The official said the so-called save shot was given when the plane was on the tarmac in Moline as Prince returned to Minneapolis following a performance in Atlanta.

The official said investigators are looking at whether Prince overdosed on the plane and whether an overdose killed him, and at what kind of drugs were involved. One possibility is the powerful painkiller Percocet or something similar, he said.

A second law enforcement official told AP that prescription drugs were discovered at Prince’s home when the musician was found dead April 21.