The shooting happened onboard an MBTA bus outside of Andrew Station in Boston around 5:25 p.m. on Friday, Dec. 30, TPD said on Twitter.
The victim, a 60-year-old woman, suffered a gunshot wound to the abdomen and was rushed to the hospital with non-life-threatening injuries, WBZ-TV reports.
Authorities believe the shooting could have been accidental, the outlet added. Anyone who recognizes the suspect is asked to contact Transit Police at 617-222-1050 or send an anonymous text to 873873.
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