A makeshift memorial on Boylston Street, near the finish line of the Boston Marathon. A message to Krystle Campbell, one of three people killed in two bomb blasts at the race two years ago, and a Champagne bottle adorned the site a day after Dzhokhar Tsarnaev was sentenced to die for his role in the attack. Photograph: Seán Proctor/The New York Times

A Kazakh exchange student who was friends with the Boston Marathon bomber was sentenced to 3½ years in US federal prison on Friday for removing a back(...)