BOSTON (CBS) – Several passengers were injured when two MBTA buses collided near Ruggles station in Roxbury Tuesday afternoon.

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Apparently, one bus slammed into another that was stopped at a light. One bus had front-end damage including a broken windshield.

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Nine people reported injuries. MBTA spokesman Joe Pesaturo says the bus was moving slowly at the time and the injuries are described as minor.

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It is unclear what caused the accident.