A piece of charcoal that wasn’t properly disposed of caused a fire at an Aina Haina church.

At about 1:08 p.m. Sunday, firefighters were called to a blaze at the Church of God on 1114 Mona Street. About 18 firefighters responded.

The fire started in a trash can outside the church building, and spread to some doors, windows and the roof. The fire was under control by 1:21 p.m.

Fire spokesman Capt. Robert Main said the fire caused about $20,000 in damages. The charcoal that caused the fire was thrown away after a barbecue last night.

"That’s a good 16 hours later when the fire rekindled," Main said, adding that residents should always make sure burning materials are completely cool before they’re thrown away.