09/13/2011 01:12 EDT | Updated 11/13/2011 05:12 EST

American Family of 8 Missing In B.C.

An American family of eight has gone missing while driving from Michigan to Alaska and police believe they may be somewhere in northern B.C.

Frederick and Laura Stevenson have six children, ranging in age from one to 15. They were driving across the U.S. and Canada in a pickup truck and a large black school bus, according to Cpl. Wahnese Antonioni of the Fort St. John RCMP.

"They were moving from Wisconsin to Circle, Alaska. They left about two weeks ago, on the 23rd of August, and they were expected to be in Alaska on September 6th."

RCMP say the last contact the Stevensons had with family was on Sept. 1, when they spoke with their daughter who lives in Michigan. The Stevensons hadn't reached Alaska at that point, and police say the daughter believes the family was in B.C. when they called.

"We've had some reports from the general public that they've been seen up in the Fort Nelson area of British Columbia. We've had the public calling in saying they've spoken to the family and saw the vehicle."

Frederick Stevenson is described as five feet 11 inches tall, 250 pounds with short brown hair, blue eyes and a goatee. Laura Stevenson is described as five feet seven inches tall, 130 pounds with long brown hair and blue eyes.

The Stevensons were travelling in two separate vehicles: a large black school bus with a white roof, pulling a plywood trailer. The bus has Louisiana licence plates, and its trailer has Michigan licence plates. The second vehicle is a red and black 1989 GMC pickup, pulling a full size GMC van that is white with blue trim, both with Michigan plates.

Fort St. John RCMP is asking the public to keep an eye out for the missing family and their vehicles, and if spotted to call 250 787 8100.