At least 29 people injured in explosion that shakes New York City

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An explosion rocked the Chelsea neighborhood of Manhattan on Saturday night, injuring at least 29 people, authorities said, adding that they are investigating the blast as a criminal act not immediately linked to any terror organization.

Mayor Bill de Blasio said early indications were that blast was intentional. He said the site of the explosion, outside on a major thoroughfare of a fashionable enclave in one of the most bustling areas of New York City, was being treated as a crime scene.

But he said there was no evidence of a "credible and specific threat" to the city. "We do not see a link to terrorism," he added.

"It is too early to determine what the incident was caused by. We believe it was intentional. A full investigation is under way."

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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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A U.S. official said that Joint Terrorism Task Force, an interagency group of federal, state and local officials, was called to investigate the Chelsea blast, suggesting authorities have not ruled out the possibility of a terror connection.One report on Twitter claimed the "huge explosion" blew out a dumpster.

Police combing the area around the scene of an explosion on Saturday in Manhattan's Chelsea neighborhood found a pressure cooker nearby connected to a cell phone with wires attached, CNN reported, citing law enforcement sources.

One witness told the New York Daily News that he saw the back of an SUV "totally blown out" after hearing the explosion while entering the subway.

"Everybody started running and screaming," the witness said.

Another witness said he saw at least one person injured on the scene.

Earlier on Saturday, a pipe bomb exploded near the route of a 5K race charity race in the beach town of Seaside Heights, New Jersey. No one was injured, but federal authorities are investigating the incident as possible terrorism.

It was unclear initially if anyone had been injured in the Manhattan explosion.

This is a developing story. Please return to AOL for updates.

(Reporting by AOL.com; Additional reporting by Reuters)

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