The Waterloo Fire Department and Monroe County EMS responded about 8:40 p.m. Friday to a residential structure fire in the 6000 block of Old Red Bud Road south of Waterloo.

Waterloo Assistant Fire Chief Mike Lloyd said the fire originated in the bathroom and spread to the attic.

“We were able to contain it to the bathroom and one-fourth of the back bedroom,” Lloyd said.

He said the cause of the fire is undetermined, but is possibly electrical in nature.