IRMO (AP) Authorities in a Columbia suburb said they are looking for an arsonist after firefighters fought more than 40 brush fires in one afternoon.

Irmo Chief Fire Marshal Jeff Allen said all the fires were set in less than five hours Sunday afternoon and evening, leading fire officials to think the blazes were intentionally set.

No one was injured in the fires. Allen said the high humidity Sunday kept the fires from spreading.

Investigators said they talking to residents to see if they saw someone out of place. The S.C. State Law Enforcement Division also flew its helicopter over the area to look for someone walking through the woods.

Firefighters from Lexington County and Columbia helped Irmo firefighters put out the blazes.

Forty brush fires reported in Irmo