Icy road conditions created problems for a dozen school buses on Prince Edward Island Friday morning.

Four school buses slid off the road. Three in western P.E.I. slid onto the shoulder and got stuck in the slush. One in North Tryon slipped slightly into the ditch.

The English Language School Board has not yet determined how many of those four buses had children on board at the time. There were no injuries.

The school board confirmed a total of 12 buses "required assistance" on Friday morning's slippery roads.

At least two towing companies were called in to help move school buses.

The school board said it made the decision to proceed with school as usual at 6 a.m. At that time, said Dave Gillis, the board's leader of corporate services, conditions were good.

"At about 7ish or so we had some heavy rains start to fall which weren't part of the forecast as they were outlined and what that did is it washed a lot of the salt and sand off of the roads," said Gillis.

"It takes about an hour, an hour and a half to get the system going or shut the system down, so after 6:30ish we were beyond the point of being able to put the brakes on."

RCMP warned about icy roads at about 8:20 a.m. By that time school bus drivers had been advised by radio that conditions had deteriorated and they should proceed with caution. The Morell family of schools reported buses were running slowly and behind schedule.

The English Language School Board was slow to comment on the incidents when called by CBC News, not being able to provide details until about 11:30 a.m.

The French Language School Board reports there were no incidents with any of its buses.