IDAHO FALLS, Idaho -

Police have a suspect in the New Year's Day robbery at an Idaho Falls Maverik.

Mark Harold Carroll, 18, has already been in the Bonneville County Jail since Jan. 7 on an unrelated charge. He was served a warrant on a robbery charge Friday, police announced Monday.

Police said Carroll entered the store at 2625 W. Broadway, around 2 a.m. Jan. 1, then threatened the clerk with a handgun and demanded she empty the cash register. He left the store with an undisclosed amount of cash.