KALISPELL, Mont. —  Dozens of volunteers joined authorities Thursday in the search for a missing 3-year-old boy last seen Wednesday night in the unincorporated town of Evergreen near here.

Officials issued an Amber Alert for Loic J.M. Rogers on Thursday morning after a search, which began shortly after he disappeared, failed to turn up any trace of the boy.

Authorities said Loic's father reported last seeing him at about 7 p.m. Wednesday after finishing dinner at a relative's house in Evergreen.

Click here for more information on the Amber Alert for Loic

Undersheriff Pete Wingert said the father told authorities he took the boy to the car and went back inside to get Loic's sibling. When he returned to the car, Loic was gone.

When last seen, Loic was wearing a red, white and blue coat, blue jeans, a long-sleeved T-shirt, tan leather boots and a multi-colored beanie hat.

Loic is 3 feet tall and has blond hair and blue eyes.

More than 200 people, mostly volunteers, were helping search for the boy.