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Video footage has emerged showing the moment an explosion ripped through Manhattan leaving 29 people injured.
The CCTV footage shows people walking past a construction site in New York's affluent Chelsea area when a large flash appears in the road.
Panicked passersby can then be seen running down the street away from the scene of the explosion.
A law enforcement official told Associated Press the explosion appeared to have come from a construction toolbox in front of a building.
A second suspicious device was later removed just blocks away from the explosion, which reportedly appeared to be a pressure cooker attached to wiring and a mobile phone.
It is not yet clear who was behind the blast and what motivated it.
New York Mayor Bill de Blasio has said the blast was “an intentional act” and tried to calm any fears among nervous New Yorkers.
Show all 25 1 /25In pictures: New York bomb explosion In pictures: New York bomb explosion A police robot accidentally detonated one of five explosive devices left outside a train station in New Jersey. Officials said the bomb squad robot cut a wire on the mechanism in a bid to defuse it - but instead set off an explosion. The device had been left in a backpack and placed in a bin outside the train station in Elizabeth
Universal News And Sport (Europe
In pictures: New York bomb explosion A member of the New York City Police Department stands guard in Herald Square
Getty Images
In pictures: New York bomb explosion New York Mayor Bill de Blasio (3-R) and New York Governor Andrew Cuomo (2-R) tour the site of an explosion that occurred in the Chelsea neighborhood of New York
Getty Images
In pictures: New York bomb explosion New York Mayor Bill de Blasio and New York Governor Andrew Cuomo tour the site of an explosion that occurred in the Chelsea neighborhood of New York on September 18, 2016. The bomb that exploded in New York
AFP/Getty
In pictures: New York bomb explosion A genral view down the street near the site of an explosion that occurred in the Chelsea neighborhood of New York
AFP/Getty Images
In pictures: New York bomb explosion New York City Mayor Bill de Blasio (L) and New York Gov. Andrew Cuomo hug after touring the site of the bomb blast on 23rd St. in Manhattan's Chelsea neighborhood
Getty Images
In pictures: New York bomb explosion A mangled dumpster sits on the sidewalk at the site of an explosion that occurred in the Chelsea neighborhood of New York
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In pictures: New York bomb explosion 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
Getty Images
In pictures: New York bomb explosion New York Mayor Bill de Blasio (2-R) and New York Governor Andrew Cuomo (3-R) stand in front of a mangled dumpster while touring the site of an explosion that occurred in the Chelsea neighborhood of New York
Getty Images
In pictures: New York bomb explosion A member of the New York City Police Department K-9 Unit patrols on a subway train between Grand Central Terminal and Times Square
Getty Images
In pictures: New York bomb explosion FBI agents review the crime scene of remnants of bomb debris on 23rd St. in Manhattan's Chelsea neighborhood
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In pictures: New York bomb explosion Members of the NYPD, FBI, ATF and other agencies investigate the the scene, following a late night explosion on West 23rd Street in New York
AFP/Getty Images
In pictures: New York bomb explosion Federal Bureau of Investigation (FBI) officials mark the ground near the site of an explosion in the Chelsea neighborhood
REUTERS
In pictures: New York bomb explosion New York Gov. Andrew Cuomo, right, walks from the scene of an explosion on West 23rd street in Manhattan
AP
In pictures: New York bomb explosion New York City Police Department (NYPD) officers stand near the site of an explosion
REUTERS
In pictures: New York bomb explosion Evidence markers on the street surround police and Federal Bureau of Investigation (FBI) officials near the site
REUTERS
In pictures: New York bomb explosion A fire truck is seen near a blocked off road near the site of an alleged bomb explosion on West 23rd Street
AFP/Getty Images
In pictures: New York bomb explosion New York City firefighters stand near the site of the explosion in the Chelsea neighborhood
REUTERS
In pictures: New York bomb explosion A New York City Police emergency services officer and his dog check a bin close to the scene
EPA
In pictures: New York bomb explosion New York City Police and Fire Department at the scene of the explosion
EPA
In pictures: New York bomb explosion A New York City firefighter uses a wheeled stretcher to carry supplies near the site of the explosion
REUTERS
In pictures: New York bomb explosion A New York City Police emergency service heavy weapons officer guards close to the scene of the explosion on 23rd Street between 6th and 7th Avenue
EPA
In pictures: New York bomb explosion New York Mayor Bill de Blasio, center, and NYPD Chief of Department James O'Neill, center right, speak during a press conference near the scene
AP
In pictures: New York bomb explosion New York City Police Emergency Services units are deployed on 27th Street and 7th Avenue where police found a second explosive device
EPA
In pictures: New York bomb explosion Police investigators look through the debris on the street in front of St. Vincent de Paul church where the explosion occurred
EPA
Mr Blasio said the explosion had no terrorist connection and wasn't related to a pipe bomb explosion that took place hours earlier in New Jersey .
He said at a news conference near the scene: "Tonight, New York City experienced a very bad incident. We have no credible and specific threat at this moment."
The incident comes just a week after the 15th anniversary of the 9/11 terror attacks, which saw thousands killed in the city when terrorists flew two hijacked planes into the World Trade Centre.
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