An arson suspect was arrested after a massive fire broke out at an apartment construction site in East Hollywood early Monday morning. Two three-story apartment buildings in the 400 block of N. Heliotrope Drive burned fiercely before firefighter doused the flames with water. The buildings were in the wood-frame stage of construction. A one-story home and a neighboring apartment building also incurred some damage. One firefighter was transported to an area hospital with minor injuries after being hit by debris. She was reported to be in good condition.