ARLINGTON (CBS) -- An MBTA bus crashed into a tree on Massachusetts Avenue Tuesday morning.
The MBTA said the bus crashed around 5:27 a.m.
Arlington Police said nobody was on board but the driver, and the MBTA said she was treated and released for unknown injuries at Massachusetts General Hospital.
The MBTA said the bus was not in service at the time, and no other vehicles were involved.
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Traffic was being diverted from the area. Police said drivers should expect heavy delays.
It was not yet known what caused the crash.
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