Police believe one man is behind a string of bank robberies in the St. Charles area this month.

Each time, in three bank robberies over a two-week period, the robber has passed a note to the teller demanding money while implying he had a weapon, police said.

Authorities say he was also spotted in several other banks and credit unions apart from the robberies.

The robberies include:

• The Regions Bank, at 423 First Capitol Drive in St. Charles, about 12:30 p.m. July 12.

• The Commerce Bank at 2700 St. Peters Parkway in St. Peters about 4:40 p.m. Friday.

• The First State Bank at 1501 South Old Highway 94 in St. Charles about 4:40 p.m. Monday.

Police describe the suspect as a white man between 5 feet 4 inches to 5 feet 6 inches tall and about 140 to 160 pounds. He has a thin build, fair skin with freckles and short light brown hair.