29 hurt in NYC blast; possible secondary device found nearby

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An explosion that hit a crowded Manhattan neighborhood Saturday night and injured 29 people was an "intentional act" but has not been linked to terrorism, the city's mayor said.

Less than three hours after the blast, an object police described as a "possible secondary device" was found a few blocks away. It was later sent to a NYPD range in the Bronx aboard a special containment vessel, the mayor's office said. Three law enforcement sources described the find as a pressure cooker with items attached.

President Barack Obama was apprised of the situation, a White House official said.

The explosion on West 23rd Street between Sixth and Seventh Avenues in Chelsea was reported at around 8:30 p.m. None of the injuries appeared to be life-threatening, but one was serious, officials said.

"There is no evidence at this point of a terror connection to this incident," Mayor Bill de Blasio told reporters at a late-night press conference, stressing that the investigation is in its early stages. He added: "The initial indication is this was an intentional act."

Police had said the blast in the Chelsea neighborhood of Manhattan appeared to come from inside a large trash bin, and photos on social media appeared to show a bin mangled in the explosion, but NYPD Commissioner James O'Neill said the explosion is believed to have occurred on the street.

"It was a loud boom, a deep boom," an eyewitness who was eating dinner nearby when the blast occurred said. "We all ran out and went down the street. You could feel it in your chest and in your legs."

The exact nature and cause of the blast has not been determined, O'Neill said.

Photos from the scene:

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Explosion in Manhattan and investigation
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Explosion in Manhattan and investigation
Fire fighters and other first responders stand near an alleged explosion on West 23rd Street on September 17, 2016, in New York. An explosion in New York's upscale and bustling Chelsea neighborhood injured at least 25 people, none of them in a life-threatening condition, late Saturday, the fire department said. / AFP / Bryan R. Smith (Photo credit should read BRYAN R. SMITH/AFP/Getty Images)
Members of the NYPD, FBI, ATF and other agencies invesitgate the the scene, following a late night explosion on West 23rd Street September, 18, 2016 in New York. An explosion rocked one of the most fashionable neighborhoods of New York on September 17 night, injuring 29 people, one seriously, a week after America's financial capital marked the 15th anniversary of the 9/11 attacks. Mayor Bill de Blasio indicated the blast was not accidental, even if there was no known link to terrorism. The blast occurred in Chelsea -- an area packed with bars, restaurants and luxury apartment blocks -- at a typically bustling time of the weekend. / AFP / Bryan R. Smith (Photo credit should read BRYAN R. SMITH/AFP/Getty Images)
Members of the NYPD, FBI, ATF and other agencies invesitgate the the scene, following a late night explosion on West 23rd Street September, 18, 2016 in New York. An explosion rocked one of the most fashionable neighborhoods of New York on September 17 night, injuring 29 people, one seriously, a week after America's financial capital marked the 15th anniversary of the 9/11 attacks. Mayor Bill de Blasio indicated the blast was not accidental, even if there was no known link to terrorism. The blast occurred in Chelsea -- an area packed with bars, restaurants and luxury apartment blocks -- at a typically bustling time of the weekend. / AFP / Bryan R. Smith (Photo credit should read BRYAN R. SMITH/AFP/Getty Images)
Evidence markers are seen on the street around officials from the New York City Police Department (NYPD) and Federal Bureau of Investigation (FBI) near the site of an explosion in the Chelsea neighborhood of Manhattan, New York, U.S. September 18, 2016. REUTERS/Rashid Umar Abbasi TPX IMAGES OF THE DAY
New York Governor Andrew Cuomo(R)visits the scene of an explosion on West 23rd Street September, 18, 2016 in New York. An explosion rocked one of the most fashionable neighborhoods of New York on September 17 night, injuring 29 people, one seriously, a week after America's financial capital marked the 15th anniversary of the 9/11 attacks. Mayor Bill de Blasio indicated the blast was not accidental, even if there was no known link to terrorism. The blast occurred in Chelsea -- an area packed with bars, restaurants and luxury apartment blocks -- at a typically bustling time of the weekend. / AFP / Bryan R. Smith (Photo credit should read BRYAN R. SMITH/AFP/Getty Images)
The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) officers stand near the site of an explosion in the Chelsea neighborhood of Manhattan, New York, U.S. September 18, 2016. REUTERS/Stephanie Keith
Police block a road after an explosion in New York on September 17, 2016. An explosion in New York's Chelsea neighborhood injured multiple people Saturday night, police said. / AFP / William EDWARDS (Photo credit should read WILLIAM EDWARDS/AFP/Getty Images)
Explosion on 23rd and 6th. These two cars had back windows blown out while driving. 8 year old in back seat injured. https://t.co/aKDra2LaIC
Apartment is being blocked off - #Explosion #Chelsea #NewYork https://t.co/B14pWOFpZ0
#Explosion outside our apartment at 23rd and 6th in #newyork. Terrified. Hoping everyone is okay. https://t.co/i3q4cG7aWT
23rd and 6th Ave NYC explosion. Emergency responded within seconds https://t.co/3ZOYQJ2A5J
The situation at 23rd and 6th in NYC. Explosion happened on 23rd, subway station blocked off. https://t.co/NPNjXqIerH
Bomb squad just arrived... Block has been cordoned off between 6th and 7th on 23rd st. https://t.co/vnZ4TxciGj
Two woman look on as police block a road after an explosion in New York on September 17, 2016. An explosion in New York's Chelsea neighborhood injured multiple people Saturday night, police said. / AFP / William EDWARDS (Photo credit should read WILLIAM EDWARDS/AFP/Getty Images)
New York City firefighters stand near the site of an explosion in the Chelsea neighborhood of Manhattan, New York, U.S. September 17, 2016. REUTERS/Rashid Umar Abbasi
New York City firefighters stand near the site of an explosion in the Chelsea neighborhood of Manhattan, New York September 17, 2016. REUTERS/Rashid Umar Abbasi TPX IMAGES OF THE DAY
New York City police and firefighters stand near the site of an explosion in the Chelsea neighborhood of Manhattan, New York, U.S. September 17, 2016. REUTERS/Rashid Umar Abbasi
People look on as the police, fire department and other first responders work near an alleged explosion on West 23rd Street on September 17, 2016, in New York. An explosion in New York's upscale and bustling Chelsea neighborhood injured at least 25 people, none of them in a life-threatening condition, late Saturday, the fire department said. / AFP / Bryan R. Smith (Photo credit should read BRYAN R. SMITH/AFP/Getty Images)
Democratic nominee Hillary Clinton talks to reporters about the explosion in Chelsea neighborhood of Manhattan, New York, as she arrives to at the Westchester County airport in White Plains, U.S., September 17, 2016. REUTERS/Carlos Barria
NEW YORK, NY - SEPTEMBER 18: Security members take security measures at Grand Central Station after the explosion in Chelsea neighbourhood in Manhattan, New York, USA on September 18, 2016. (Photo by Bilgin S. Sasmaz/Anadolu Agency/Getty Images)
NEW YORK, NY - SEPTEMBER 18: Security members take security measures at site after the explosion in Chelsea neighbourhood in Manhattan, New York, USA on September 18, 2016. (Photo by Bilgin S. Sasmaz/Anadolu Agency/Getty Images)
Members of the NYPD, FBI, ATF and other agencies invesitgate the the scene, following a late night explosion on West 23rd Street September, 18, 2016 in New York. An explosion rocked one of the most fashionable neighborhoods of New York on September 17 night, injuring 29 people, one seriously, a week after America's financial capital marked the 15th anniversary of the 9/11 attacks. Mayor Bill de Blasio indicated the blast was not accidental, even if there was no known link to terrorism. The blast occurred in Chelsea -- an area packed with bars, restaurants and luxury apartment blocks -- at a typically bustling time of the weekend. / AFP / Bryan R. Smith (Photo credit should read BRYAN R. SMITH/AFP/Getty Images)
NEW YORK, NY - SEPTEMBER 18: A mangled dumpster sits on the sidewalk at the site of an explosion that occurred on Saturday night on September 18, 2016 in the Chelsea neighborhood of New York City. An explosion in a construction dumpster that injured 29 people is being labeled an 'intentional act'. A second device, a pressure cooker, was found four blocks away that an early investigation found was likely also a bomb. (Photo by Justin Lane-Pool/Getty Images)
NEW YORK, NY - SEPTEMBER 18: New York Governor Andrew Cuomo (R) and New York Mayor Bill de Blasio (L) talk to area residents while touring the site of an explosion that occurred on Saturday night on September 18, 2016 in the Chelsea neighborhood of New York City. An explosion in a construction dumpster that injured 29 people is being labeled an 'intentional act'. A second device, a pressure cooker, was found four blocks away that an early investigation found was likely also a bomb. (Photo by Justin Lane-Pool/Getty Images)
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"We do have video, and we see the explosion," he said, adding that no arrests had been.

The FBI Joint Terrorism Task Force is on the scene. The federal Bureau of Alcohol, Tobacco and Firearms said a New York arson and explosives task force was responding to the blast.

The "possible secondary device" was found at 27th Street between Sixth and Seventh Avenues, the New York Police Department said on Twitter shortly after 11 p.m. ET.

Three law enforcement sources told NBC News investigators at the second location were examining what appeared to be a pressure cooker with "tape, wires and a cell phone" left on the sidewalk. The bomb squad was investigating although it had not been confirmed that the object is an explosive device.

"There was a loud boom and our entire apartment shook," said Neha Jain, 24, who lives on West 23rd and Sixth Avenue. "All the pictures fell to the floor and then I heard people screaming."

Jain said the explosion shattered the glass in her building's lobby. "My first thought was it's a bomb," Jain said. "It's quite terrifying."

A large police presence, including the New York Office of Emergency Management and the NYPD's counterterrorism unit responded to the scene.

There is a construction sites near the scene of the Chelsea explosion. Police searched cars and trash cans in the area.

Facebook activated its "Safety Check" feature so that users can easily notify friends and family members of their status.

Bellevue Hospital said it was treating nine patients from the explosion, all of whom are stable.

De Blasio also said the investigation has found no link to an explosive device that blew up in a Jersey Shore community earlier Saturday, and which occurred near a planned race route.

An official told NBC News that they were going "compare components from the New Jersey blast to evidence at ny scenes to see IF there are similarities in the devices".

In that incident in Seaside Park, a device consisting of three pipe bombs exploded along the planned route of a 5K Marines charity race. No one was hurt. The explosive device was placed in a trash can in that incident, NBC New York reported.

Democratic presidential candidate Hillary Clinton said she was briefed about the explosion as well as the explosive device in New Jersey, but said she would have more to say on the New York incident until the more is known. "Obviously, we need to do everything we can to support our first responders. Also to pray for the victims," she said.

Her Republican rival, Donald Trump, mentioned the explosion at the start of an event in Colorado Springs, and said a "bomb" went off in New York. "Just before I got off the plane a bomb went off in New York, and nobody knows exactly what's going on, but boy, we are living in a time," Trump said. "We better get very tough, folks."

Clinton also called the incident in New York a "bombing" when speaking to reporters Saturday night. New York officials have not said the explosion was a bomb.

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