Ahmad Khan Rahami, a naturalised US citizen born in Afghanistan, is a suspect in New York and New Jersey blasts
After a manhunt, Mr Rahami was arrested in New Jersey following a shoot-out with police
At least 29 people were injured in an explosion in the Chelsea district of New York City on Saturday night
Backpack containing up to five devices exploded in Elizabeth, New Jersey
Republican Donald Trump blames the immigration system and is accused of demagoguery by Hillary Clinton
Andrew Cuomo says: "We will not allow these types of people and these types of threats to disrupt our life in New York.
"That's what they want to do. We're not going to let them do it. This is freedom, this is democracy, and we're not going to allow them to take that from us."
"Whoever placed these bombs, we will find, and they will be brought to justice. Period," Mr Cuomo says.
Mr Cuomo says the response of the emergency services in New York was "extraordinary".
Andrew Cuomo also says the pipe bomb explosion in neighbouring New Jersey on Saturday morning did not appear to be connected, as it was a different kind of device.
"We have no reason to believe at this time that there is any further immediate threat," Mr Cuomo says.
However, close to an additional 1,000 New York state police officers and National Guard will be deployed to airports, bus terminals and subway stations, he adds.
Andrew Cuomo, the governor of New York is holding a news conference in New York.
He says there's currently no evidence of an "international terrorism connection" with the explosion, but adds that it is "very, very early in the investigation".
Image source, ReutersThe device discovered close to where the explosion took place was towed away in a specialised trailer by the New York Police's bomb squad
Image source, ReutersEvidence markers are set out near the site of the explosion in the Chelsea neighborhood of Manhattan
This image of a metal container damaged by the blast was tweeted, external by the New York Police Department's counterterrorism unit.
Image source, Chris Duffy
Image source, APNew York Governor Andrew Cuomo (right) examines the site of the explosion for himself
Republican presidential candidate tweets:
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Victor Asal of the University at Albany, who specialises in the study of terrorism and homeland security, says Mayor de Blasio has not entirely ruled out a terror attack as being the cause of the explosion, but is not rushing to do so either.
Quote MessageWhen you start talking about terrorism you're framing things in a certain way that's going to grab a lot of attention, make people very nervous.
Quote MessageAnd it may well go in that direction, but right now what he'd like to do is say 'we're not sure yet'.
Quote MessageUntil we are, he doesn't want to make that connection, because that connection has huge political impacts.
Image source, NYCityAlertsThe pressure cooker, attached to wiring and a cellphone, that was found four blocks away. It was removed safely.
Image source, APDawn rises in New York on the site of the explosion, where police continue to investigate
Image source, APAs daylight sets in, police painstakingly search the area where the explosion happened
It was a tough first full day at work for Police Commissioner James O'Neill - he was sworn in as head of the NYPD on Friday, taking over from Bill Bratton.
Dominic Casciani
Home Affairs Correspondent
The second device found in New York has been described as a pressure cooker attached to wiring and a mobile phone – and this mode of attack was last seen in the USA during the Boston Marathon bombings of 2013.
A pressure cooker device also featured in a failed jihadist plot to attack New York’s Times Square in 2010. Extreme right-wing cells have also made them, and the instructions are freely passed around on the internet.
The US, like the UK, has a dedicated laboratory, external where forensic experts analyse the remains of every significant explosive device that the security services recover.
Tiny fragments of a detonated device can be enough to pinpoint how it was made – and potentially who made it. Two years ago the US scientists had a major victory when their painstaking work uncovered evidence that proved that a London taxi driver had made bombs in Iraq that killed a soldier.
The Fire Department of New York said 24 people were taken to hospitals with their injuries.
One person received a puncture wound that was considered serious. The other injuries were described as scrapes and bruises.
Eyewitness David McKay said he heard a noise that he thought was "a sonic boom", but was actually an explosion.
This map shows the location of the blast in the Chelsea area of Manhattan, and where a potentially explosive device was also found nearby.
