An early morning fire at a central Phoenix Planned Parenthood is under investigation.

Firefighters were called out to the smoke-filled building near Seventh Avenue and Camelback Road early this morning.

They found a small fire that they were quickly able to douse. That, however, generated quite a bit of smoke.

The location was the site of a large protest on Saturday. When asked if there was anything suspicious about the fire, the Phoenix Fire Department originally said it was too early to tell and an investigation would have to be conducted.

"Normally, with this type of fire, we always have an investigator come out. [Fire crews were told] there hadn't been any recent threats to this Planned Parenthood," Capt. Lynn Smith of the Phoenix Fire Department.

Investigators spent the morning at the scene.

Phoenix Fire Division Chief Mike Sandulak said later the cause of the fire was an electrical problem at the back of the building. He said it was not arson.

The fire caused about $500,000 in damage to the building.

No injuries were reported, but Seventh Avenue was blocked off for a time just south of Campbell Avenue.