Four passengers were injured when a bus driver crashed into parked cars on the Alameda early Wednesday morning, a spokesman for the Maryland Transit Administration said.

The bus hit one parked car on The Alameda near 33rd Street at 2:42 a.m. that triggered a domino effect, said spokesman Terry Owens. Eight parked cars were damaged as a result, he said.

Four passengers were taken to Union Memorial Hospital for treatment of injuries that were not considered life-threatening, Owens said.

MTA officials and Baltimore Police are investigating, but preliminary reports suggest the bus driver either fell asleep or blacked out, he said. The driver will undergo a drug test, which is standard procedure, the spokesman said.

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