About 300 residents were evacuated from a Pico Rivera apartment complex after a third-floor unit erupted in flames that quickly spread through the building Thursday. The fire started around 3:30 p.m. in the 9100 block of Burke Street. The fire appeared to have started in a vacant room and then spread through the rest of the building. Tenant Jesse Aguilar witnessed the fire erupting in the third floor room. He said he grabbed a fire extinguisher and tried to put the flames out himself. "By the time I got there, the flames were already too much. I saw the whole side of the wall just catch on fire. I started spraying the fire extinguisher on it and it was just too much. After I did that, the ceiling came down and when it came down that's when the fire department told me to evacuate," he said.