GETTY Donald Trump speaks to supporters at an election rally in Colorado

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The New York explosion injured 29 people and was caused by one of two devices discovered in the city last night. Republican Presidential candidate Trump, who hails from New York, jumped on the issue of national security as he appeared at an election campaign event in Colorado. Mr Trump told supporters: ”Just before I got off the plane, a bomb went off in New York, and nobody knows exactly what's going on."

GETTY Police and firefighters are the scene of last night's Manhattan explosion

We are going to get tough and smart and vigilant and we are going to end it Donald Trump

He continued: "We'd better get very tough, folks. "It's a terrible thing what's going on in our world, what's going on in our country. "But we are going to get tough and smart and vigilant and we are going to end it." Democrat rival Hillary Clinton refused to say anything other than that she had been briefed. Mr Trump’s remarks came several hours before New York officials publicly confirmed details of the incident or what caused the explosion, in Manhattan's bustling Chelsea district, although it was later confirmed as “an intentional act”.

GETTY Donald Trump arrives in Colorado for an election rally

New York Governor said the explosion was a terror attack but stressed no links to a any international terrorist group like ISIS had been found. He said: A bomb exploding in New York is obviously an act of terrorism. "Whoever placed these bombs - we will find them and they will be brought to justice. "We will not allow these type of people and these type of threats to disrupt our life in New York. “This is freedom. This is democracy, and we are not going to allow them to take that from us. "They want to instil terror. They want to make you worry about going into New York. We're not going to let them instil fear."

GETTY Emergency services raced to the scene of the blast in New York

A Joint Terrorism Task Force, a group made up of federal, state and local officials, was called to investigate, suggesting authorities have not ruled out the possibility of a terror connection. The second device was made up of a pressure cooker connected to a cell phone with wires attached. That same sort of device was used by the Boston bombers in 2013. The two Massachusetts brothers behind the attack on the Boston Marathon used pressure cookers packed with explosives and detonated with timing devices to kill three and injure more than 260 people. In an unrelated attack, a pipe bomb was detonated in nearby New Jersey at a charity race on Saturday. The government’s same Joint Terrorism Task Force is also investigating that attack.

GETTY Hillary Clinton briefs reporters aboard her campaign plane

Mrs Clinton issued a short statement on her campaign plane on the ground in New York, saying she had been briefed on "the bombings in New York and New Jersey". But she said she would wait until she had more information before commenting further. A White House official said President Barack Obama, who was attending a congressional dinner in Washington DC at the time of explosion, had been “apprised of the explosion in New York City, the cause of which remains under investigation”.