An investigation is underway after a fire broke out at an apartment complex. It started around 3:30 a.m. Saturday morning at an apartment on Lakeshore Drive. Firefighters say it quickly spread to surrounding units and four total apartments were damaged. We're told everyone inside the units was able to get out safely. Officials say while two of the apartments were heavily damaged, the building is not a total loss.. It's still not clear what stared the flames.