Boston goes into virtual lockdown

Black Hawk helicopters and heavily armed police descended on a Boston suburb yesterday in a massive search for an ethnic Chechen suspected in the Boston Marathon bombings, hours after his brother was killed by police in a late-night shootout. The normally traffic-clogged streets of Boston were empty as the city went into virtual lockdown after a bloody night of shooting and explosions. Public transport was suspended, air space restricted and famous universities, including Harvard and MIT, closed after police ordered residents to remain at home. Officials identified the hunted man as Dzhokhar Tsarnaev, 19, and the dead suspect as his brother, Tamerlan Tsarnaev, 26, who was killed Thursday night in the working class suburb of Watertown. Details emerged yesterday about the brothers, including their origins in the predominantly Muslim regions of Russia’s Caucasus, which have experienced two decades of violence since the fall of the Soviet Union. The fugitive described himself on a social network as a minority from a region that includes Chechnya, Dagestan and Ingushetia. A man who said he was their uncle said the brothers came to the United States in the early 2000s and settled in...