A would-be suicide bomber detonated a pipe bomb strapped to his body in the heart of Manhattan’s busiest subway corridor, rending the early Monday commute with a blast that reverberated up through the city’s sidewalks, caused transit chaos, and terrified thousands of travelers who fled headlong through tunnels choked with smoke.
He chose the location because of its Christmas-themed posters, recalling strikes in Europe against Christmas markets, he told investigators, and set off his bomb in retaliation for U.S. airstrikes on ISIS targets in Syria and elsewhere, several law enforcement officials said.