Mayor Bill de Blasio said: "This was an attempted terrorist attack". "So he wound up hurting himself; several others in the vicinity".
Other injuries minor: Two victims at Mount Sinai West and one at Mount Sinai Queens are being treated for headaches and ringing in the ears, Nigro said. He assured the public that there are no credible and specific threats to New York City at the moment.
"At this point in time, all we know of is one individual who - thank God - was unsuccessful in his aims", de Blasio said during a press conference.
Ullah was hurt and is in custody, authorities said. He is now being treated at Bellevue Hospital.
A photo taken shortly after the explosion shows a bearded man on the ground, with his hands in cuffs behind his back.
Type of device: Ullah wore an "improvised low-tech explosive device attached to his body", which he intentionally detonated, Police Commissioner James O'Neill said. Reports indicate the bomb went off prematurely.
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"Could have been a lot worse", a federal law enforcement source told CNN.
"Our lives revolve around the subway", he said.
O'Neill said it wasn't clear whether the suspect detonated the device by accident or whether the location was intentional.
How bomb was made: According to a senior NY law enforcement official and a city official being briefed on the investigation, Ullah told police he made the device at his workplace.
Asked whether the suspect has connection with the Islamic State, O'Neil said, "He did make a statement but we are not going to talk about that right now".
A pedestrian named Antonio told Xinhua that he was really concerned that such incident might seriously affect tourism in New York City because people will be anxious about their safety and choose to travel to other places.
The Port Authority bus station was also evacuated.