A fire on Green Bay's east side Monday night displaced four people and caused about $30,000 damage. The blaze at 1286 E. Mason St. was reported about 7:10 p.m. Firefighters found smoke coming from the building's eaves and roof, Drew Spielman, a Green Bay Metro Fire Department battalion chief, said in a news release. Damage was centered on the building's upper apartment, as fire burned through insulation from the attic above the living space, Spielman said. No injuries were reported. The city fire marshal's office is investigating. American Red Cross volunteers are assisting the residents.