A suspected terrorist detonated a potentially deadly “improvised low-tech explosive device” inside a New York City subway passageway during Monday morning rush hour, injuring himself and three other people and causing chaos at one of the city’s key traffic hubs. The device went off in the 42nd Street passageway between 7th and 8th avenues, and the suspect, later identified as Akayed Ullah, 27, was taken into custody, NYPD Commissioner James O’Neill said. The incident happened at about 7:20 a.m. in the busy underground tunnel near both the Times Square subway station and the Port Authority Bus Terminal. None of the...