MBTA Transit Police report an Orange Line rider engrossed in a game on his iPhone 4 failed to notice the guy who was about to snatch it out of his hands as the train pulled into Tufts Medical Center around 12:20 p.m.
However, police say:
The victim gave chase, following Isiah Cooper out onto Washington Street. The victim was yelling for passersby to stop Cooper. Several security guards from Tufts Medical Center happened to be posted in front of the hospital and were able to stop and detain Cooper til arrival of Transit Police.
Cooper, 25, of Jamaica Plain, was charged with unarmed robbery. The victim's iPhone was recovered, police add.