Video shows moment of attempted terror attack in NY

Akayed Ullah: 5 Things To Know About Port Authority Suspected Bomber

De Blasio said at the same press conference that the incident was an attempted terrorist attack and "thank God the perpetrator did not achieve his ultimate goals".

He had a homemade device that either did not fully detonate or malfunctioned in some way, resulting in burns to his hands and abdomen as well as lacerations.

- Ullah is in custody and is now at Bellevue Hospital.

The explosion triggered a massive emergency response by police and firefighters both above and below ground, tangling subway and bus service at the nearby Port Authority bus terminal. Authorities are investigating how it was made, but think the suspect may have made the bomb at work, CNN reported.

A video released on Twitter shows a puff of smoke erupting amid a stream of commuters. Sources say the bomb only partially detonated after malfunctioning.

More on suspect: In conversations with authorities, Ullah pledged allegiance to ISIS, according to one law enforcement official with direct knowledge of the investigation.

What do we know about suspect Akayed Ullah?

It's unclear "whether he drove for any particular base, or whether he simply got the license but didn't drive at all", Fromberg said.

"Nothing is going to change", she said.

The NYPD later said a fourth person also sustained minor injuries.

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"The choice of NY is always for a reason, because we are a beacon to the world", the mayor said.

Motive: Ullah told investigators he carried out the attack because of recent Israeli actions in Gaza, a law enforcement source said.

He lived in the same apartment building as his brother whom he recently worked with at an electrical company close to Port Authority, police said.

Johnson told ABC News, "Today I wanted to make a point of coming through this subway, this specific passage at this exact time, to really demonstrate what a lot of New Yorkers are demonstrating - which is that events like this happen, but we're strong, we're resilient, we go on and we are not afraid".

De Blasio said there are no other known credible threats to the city at this time.

Joon Kim, acting USA attorney for the Southern District of NY, said at a news conference today that Ullah allegedly aimed to "murder as many innocent human beings as he could and to blow himself up in the process - all in support of a vicious terrorist cause".

Since the events of 9/11, New York City has remained relatively immune from the sort of terror attacks we've seen in European cities over the past five to ten years, though in the past year or so that has changed.

Kim said New York City "consistently remains" a prime target for terrorism. In April, 15 people were killed after a suicide bomber hit the metro in St. Petersburg, Russia.

Police officials have confirmed he is 27-year-old Akayed Ullah.

In September, an attack on a London train injured 29 (paywall) when a bomb concealed in a bucket exploded during rush hour.