Cambridge, Mass.: A Refugee Magnet

Tamerlan Tsarnaev, the older brother – now dead – of the two men suspected of setting off the bombs at the Boston Marathon earlier this week, once confided to a photographer, "I don't have a single American friend, I don't understand them."

The 26-year-old Tsarnaev was a boxer who once said he hoped to become a naturalized American on the U.S. Olympic team. His 19-year-old brother Dzhokhar – the suspect still at large in a citywide manhunt – was a student athlete of the month at a Cambridge high school, later the winner of a $2,500 scholarship from the city. But despite some biographic details (and Olympic aspirations) that look utterly ordinary, the two men, who officials say were of Chechen origin, evidently failed to integrate with the Cambridge community (yet bafflingly chose not to flee it after Monday's bombing).