The mother of a missing Sudbury boy was reunited with her 10-year-old son north of Toronto early Tuesday morning.

The mother rushed into a Newmarket police station to see her son, who had left Sudbury with his father on Saturday. Shortly after, the pair got into a van to make their way home.

Police say the boy left Sudbury with his father willingly on Saturday afternoon, but the man made comments Tuesday that caused concern for the boy’s well-being.

The father had recently been diagnosed with depression.

Police issued an Amber Alert for the boy, who was found safe in a Newmarket home early Tuesday.

Several hours later, police arrested the boy’s 41-year-old father at Mavis Drive and Highway 400, moments before he turned onto the highway.

Sgt. Bill Boogaard of York Regional police said investigators triangulated the father’s cell phone signal to track him down.

“He did make some phone calls,” Boogaard told reporters at the scene of the father’s arrest. “We triangulated the calls to this area, so we suspected he was here.”

The boy’s father is being returned to Sudbury to face charges of criminal harassment, mischief and dangerous driving.

With a report from CTV’s Austin Delaney and files from The Canadian Press