New York mayor says evidence Chelsea blast was 'intentional act'

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New York City Mayor Bill de Blasio says explosion in the Chelsea neighborhood was likely an 'intentional act' but says there is no evidence the incident was connected to 'terrorism.'

This is a breaking news update. See earlier reporting here.

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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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