A joint investigation  is underway in Hemmingford, Que., near the U.S. border, after a collision involving a driver who was arrested for impaired driving, and a second vehicle that police said was carrying "illegal immigrants," some of whom fled the scene on foot.

The Sûreté du Québec (SQ) said emergency responders were called at around 4:15 a.m., for a collision on Route 202, near the intersection of Jackson Road, in Hemmingford, roughly 65 kilometres south of Montreal. 

SQ spokesperson Stéphane…