11/15/2012 08:26 EST | Updated 01/15/2013 05:12 EST

Abducted B.C. boy taken into U.S.

A man who police allege abducted his three-year-old son in southeastern B.C. has crossed the border into the United States, RCMP have confirmed.

An Amber Alert was issued Thursday afternoon after the boy was taken from the Elk Valley area, near the Alberta border. Alberta and Montana also issued their own Amber Alerts in the case Thursday night.

RCMP identified the boy as Alvin Barnett and the abduction suspect as his father, Robert Barnett. Police said Barnett was travelling in a blue 2002 Subaru Outback with B.C. licence plate 347SBL.

The father is described as 39 years old, five feet five inches tall, with reddish-blond hair, and a scar above his right eyebrow.

Police said anyone who spots the vehicle should not approach it but should call 911.

RCMP spokesman Cpl. Dan Moskaluk said the Amber Alert would remain in effect for the time being.

Moskaluk said the child and father were together during a supervised parental visit, indicating the father had limited access to his child, and as a result the incident met the criteria for an Amber Alert.