Twelve million honey bees were released along Canada's largest highway in northwest New Brunswick on Monday after a transport truck overturned.

Royal Canadian Mounted Police said a truck carrying 330 crates of bees was negotiating a ramp when the load shifted and the truck overturned.

Police said a downpour of rain has helped to contain the bees in and around the truck.

Bee experts from Agriculture Canada were called in to help deal with the accident.

The driver of the truck was not hurt.