Crews are battling a fire at a vacant building in the 3000 block of Tyler on the city's west side this morning.
Firefighters got the call just after 4 am.
Two investigators on arson patrol saw the fire, and went inside after calling crews to gather more information.
We're told they believe that multiple fires were set in the basement, and they suspect this is arson.
Stay with wxyz.com for updates on this developing story.