FLAGSTAFF, Ariz. (AP) _ A Greyhound bus collided with a truck in northern Arizona this morning, injuring at least 14 people, officials said.

The bus was northbound on Interstate 17 about 30 miles south of Flagstaff when it rear-ended a truck at the crest of a hill, said Katherine Williams, a Greyhound spokeswoman in Dallas. Williams said she didn't know if the truck was stopped or moving slowly.

Fourteen people were being transported to Flagstaff Medical Center, two of them with serious injuries and the rest apparently with minor injuries, said Kathy Dean, a hospital spokeswoman.

The bus, carrying 41 people plus a driver, was heading from Phoenix to Salt Lake City, Williams said.

The bus hit a truck that was hauling cars, said Officer Jim Harnack in the state Department of Public Safety duty office. Neither he nor Williams could immediately say how many of the injured were from the bus and the truck.

Northbound lanes of the interstate remained closed following the accident, Harnack said.

No other details were immediately available.