Official said the Middlesex Federal Savings Bank on College Avenue was robbed by a man who then exchanged gunfire with Somerville police.
The robber is described as a Hispanic male and about 5 feet, 10 inches tall. He was wearing a dark knit cap, a green jacket and dark pants.
As the man runs down the sidewalk, carrying a backpack in one hand, the bystander shoved him into a wall and a shrub. The robber kept going, but dropped the backpack, which was recovered by police.
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