Authorities are looking for a man who robbed a Cornelia bank Saturday after threatening employees with a hand grenade. Cornelia Police Chief Rick Darby described the suspect as a white man in his mid 30s to mid 40s, medium build and 5-foot-8 to 5-foot-10. The suspect was wearing a khaki hat, dark jacket and jeans at the time of the incident, which took place about 11:10 a.m. at United Community Bank at the corner of U.S. 441 and Level Grove Road.