FORT MITCHELL, Ky. (AP) _ An Army officer and five Canadians face charges in connection with North America's largest confiscation of illicit steroids intended for human consumption, the U.S. Customs Service said Monday.

Clint Medford, 29, of El Paso, Texas, a captain stationed at the Army's Fort Bliss base, was arrested Friday along with Tibor Reiter, 47, of Weston, Canada, Customs agents announced. The arrests occurred when agents seized a tractor-trailer truck in Erlanger, Ky., that contained 25,790 units of steroids whose total worth authorities estimated at $2.1 million.

Reiter had been driving the truck and Medford was following behind in a car when the two were arrested early Friday as the shipment of vials and boxes was being delivered to undercover agents, federal authorities said.

The Customs Service retained custody of the drugs and truck. Canadian authorities, including the Royal Canadian Mounted Police, worked with the Customs Service to develop the case in a four-month undercover investigation that led customs agents to London, Ontario, Canada.

The two remained in federal custody Monday in northern Kentucky. U.S. Magistrate J. Gregory Wehrman set a $45,000 bond for Reiter, but allowed no bond for Medford because he faces an outstanding warrant in Texas, federal authorities said.

Customs agents said Medford and Reiter face U.S. charges of smuggling. The charges carry maximum punishment of five years in prison and a $10,000 fine.

Charged in Canada were Medford; Reiter; James Connolly, 39, of Brampton, Ontario; and Ronald Sutherland, 43, Graeme McRae, 43, and Albert Beraldo, 36, all of London, Ontario, U.S. Customs officials said.

Authorities said the Canadian charges involve either smuggling or selling controlled drugs without a prescription.