Authorities say two teenage boys have admitted to starting a fire that damaged a portion of a bridge on the Lake Wobegon Trail in central Minnesota.

The boys were questioned in connection with a fire on Saturday that damaged the bridge at Schwinghammer Lake near Albany. They were released to the custody of their parents while the Stearns County attorney’s office reviews the case for charges, the Stearns County Sheriff’s Office said.

A bicyclist discovered the fire around 5:15 p.m. and called 911. He also shot a video that showed flames shooting out from beneath the bridge and posted it on the Lake Wobegon Trails Facebook page.

Firefighters from Avon, Albany and Freeport spent five hours dousing the flames that damaged wooden planks on the west end of the 216-foot bridge. The bridge is supported by large steel beams which are strong enough to hold trains. They were not damaged.

Inspectors from Stearns County and the Minnesota Department of Natural Resources found the bridge structurally sound and reopened it on Monday.