Updated with MIT info.
Boston Police report the victim was pronounced dead at the scene shortly after the 3:30 p.m. incident.
A mangled silver and black bicycle, believed to be hers, was found several blocks away on Bay State Road at Silber Way, Brian D'Amico reports.
According to MIT, Miura had come to Cambridge last fall from Japan's National Institute of Advanced Industrial Science and Technology. She had been working in Prof. Russ Tedrake's Robot Locomotion Group.
"Our hearts go out to her friends and colleagues at MIT, and especially the Miura family, who must absorb this terrible loss from so far away," MIT President L. Rafael Reif wrote to MIT students and staff in e-mail tonight.