Good morning on this soggy Tuesday, and Happy Hanukkah.

A would-be suicide bomber detonated a homemade explosive in a busy subway corridor near the Port Authority during yesterday’s morning commute, in what officials are calling an act of terrorism — the second in New York City in six weeks. The explosion filled the corridor with smoke and sent commuters scrambling into the streets.

Here’s what we know about the attack as of this morning.

What happened? A man detonated a pipe bomb that was strapped to his body in a pedestrian passageway between the Times Square and Port Authority subway stations around 7:20 a.m. yesterday. Here are detailed maps of where the attack took place.

Was anyone killed? No, but three people sustained minor injuries. The attacker was the only one severely injured; he was taken into custody by the police shortly after the bombing and was transported to Bellevue Hospital, where he was treated for burns to his hands and abdomen.

Who was responsible? Officials identified the man they arrested as Akayed Ullah, 27, of Brooklyn. Mr. Ullah moved to the United States from Bangladesh in 2011 on a family immigrant visa. He often prayed at a local mosque, worked for a time driving for a car service, and was described as a “good guy” by a cabdriver who knew him. Here’s what we know about Mr. Ullah and his life in Brooklyn.