The RCMP say a B.C. man and his young son who are the subject of an Amber Alert may have entered the United States.

Police issued the alert for three-year-old Alvin Barnet, who they believe was abducted by his father, 39-year-old Robert Barnet, in the Elk Valley of southeast B.C. area near Sparwood.

Police say the pair may be travelling in a 2002 blue Subaru Outback with B.C. license 347 SBL.

RCMP say the father is believed to have crossed the border into the United States, possibly into Montana.

Alvin is three-feet-two inches tall, and 35 pounds, wearing a red shirt and blue jeans, while his father is described as five-foot-five with green eyes, reddish blonde hair and a scar over his right eyebrow.

Police say anyone seeing the pair should not approach them, but should call 911.