CNN) -- A gunman walked into an LA Fitness gym outside Pittsburgh, Pennsylvania, turned off the lights and fired off 50 rounds, killing three women before killing himself Tuesday evening, police said.

Authorities are at the scene of a shooting at an LA Fitness gym near Pittsburgh, Pennsylvania.
The man didn't speak but was carrying a gym bag with a note inside it. He was found dead in the gym lying on top a gun about 7 feet away from a victim, said Charles Moffatt, Allegheny County police superintendent.

At least 10 other people were injured in the barrage of bullets that sent people in the gym ducking for cover, Moffatt said.

A law enforcement source identified the gunman as George Sodini, a 48-year-old gym member.

Moffatt would not release the name of the victims during a Wednesday news conference.

Sodini was a systems analyst in the finance department of K&L Gates, a law firm with an office in Pittsburgh, said Mike Rick, a spokesman for the firm. Sodini had worked for the firm since 1999, Rick said.

Neighbors described Sodini as a bit of a recluse. They said he had stopped talking to neighbors