WASHINGTON (AP) — Metro has removed a total of 94 buses from service after one caught fire in Maryland, the second such fire in less than a week.

Metro says there were no passengers aboard the Orion VI bus traveling on Route 50 when it caught fire Tuesday, and no one was injured. Last Thursday, another Orion VI bus caught fire in Fairfax, Va. There were no passengers and no injuries.

After Thursday’s fire, Metro reduced the use of the buses and brought in an outside expert to investigate.

Metro operates 1,492 buses. The Orion VI buses use diesel fuel and have been in use since 2000. The buses served routes in northern Virginia, Prince George’s County, Montgomery County and parts of Washington. The buses will remain out of service until further notice.

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