Buffalo fire officials sounded a second alarm to bring extra manpower to the scene of a kitchen fire on the third floor of a downtown Niagara Street apartment building early Saturday morning.

Firefighters responded to a 4:51 a.m. alarm at 220 Niagara St., where witnesses reported that many residents fled from the smoke-filled building.

Fire officials listed $35,000 damage to the three-story building. The cause of the kitchen fire remains under investigation.