A Ride-On bus caught fire Monday night on a road in the eastern part of Montgomery County, in what was at least the sixth fire in the fleet in three years. However, the bus was of a different make than those in the other incidents.

No passengers were aboard the bus, which burned about 8:30 p.m. Monday at New Hampshire Avenue and Dilston Road in the Silver Spring area, officials said, and no injuries were reported.

The cause of the fire was not known, and the amount of damage had not been determined, said David Dise, chief of the county department of general services.

He said the fire occurred on an Orion V bus, a vehicle that is larger than the Navistar buses involved in the other incidents.

“We have not had problems with [the Orion buses] in the past,” Dise said.

He said the driver reported that the fire began in the middle-to-rear section of the bus and spread toward the rear.

The vehicle had traveled about 3,500 or 4,000 miles since undergoing its most recent preventive maintenance inspection, Dise said.

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