A crazed gunman walked into an aerobics class at a L.A. Fitness gym in Collier Township, Pennsylvania, on Tuesday night and opened fire on an unsuspecting aerobics class.

The gunman walked into the class, and turned out the lights, before opening fire and killing five women and injuring many more.  It is being reported that the gunman then killed himself.

Witnesses said a gunman wearing a black hat walked into an aerobics room filled with women shortly after 8 p.m., turned out the lights and opened fire.

Witnesses reported hearing dozens of gunshots before the shooting stopped.

“All of a sudden there was a really loud noise,” said Julia Zorzi, 27, of Crafton, who was on a treadmill on the main floor when the gunfire began. “I heard 40 to 50 shots, and I hit the deck. I saw people running out. I ran outside and there were two girls lying outside.

The cops have not released information about the killer or any motive. We will update this post with breaking news on this tragic event as it becomes available.

Our thoughts and prayers go out to the families of those killed or shot during the masacre.

UPDATE: Police have identified the killer as George Sodini.