The mayor of Washington Park, Illinois, was shot and killed Thursday morning, according to the town's police department.
Mayor John Thornton was shot twice in the chest at close range while driving, CNN affiliate KMOV reported. His car swerved off the road and ran into a tree.
One person is in custody, and police are looking for a second suspect, KMOV said.
Washington Park is in St. Clair County, close to St. Louis, Missouri.