Investigators believe a fire at a northeast-side apartment complex was started by a man they said took off, allegedly armed.

At least 11 units responded to the fire in the 9500 block of Perrin Beitel just after 6 a.m.

Officials said that the fire was sparked by a man who was fighting with a woman in one of the units at the complex.

The man reportedly took off after starting the fire. As of 7 a.m., police had not located the man but said arson investigators were headed to the scene.

It was not immediately clear how much damage was caused by the fire. No injuries were reported.