01/18/2013 04:44 EST | Updated 03/20/2013 05:12 EDT

Bus driver in Oregon crash barred from driving in U.S.

Two Canadian bus drivers employed by the company involved in the deadly Oregon bus crash have been barred from operating commercial vehicles in the United States.

The U.S. Department of Transportation says Mi Haeng Kyu (James) Hwang and Choong Yurl Choi are imminent hazards to public safety.

The men, who are both employees of Port Coquitlam bus company Mi Joo Tour & Travel, were driving well beyond the 70-hour limit over a seven-day period, according to the department’s investigation.

Hwang was the driver of the bus that crashed and Choi was operating a second Mi Joo bus as part of the same tour excursion trip.

Police have not yet said what caused the bus to skid off a highway near Pendleton, Oregon on Dec. 30, killing nine people and injuring 39 others, but the department alleges that speed played a part in the crash.

In January, Mi Joo Tour & Travel was ordered to cease operations in both Canada and the U.S.