Donald Trump weighed in on the cause of an explosion in New York City, declaring a “bomb went off” well before local authorities had made any official declaration about what had happened. Twitter responded swiftly, accusing the Republican presidential nominee of fear-mongering. 。

Trump's comments came as he campaigned in Colorado, less than an hour after the 8:30pm ET explosion in the Chelsea neighborhood of Manhattan. Two hours later, the cause of the explosion was still being investigated, officials said. At the time of publishing, this is still the case. 。

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At least 29 people were injured and there were no reports of casualties outside the Associated Blind Housing facility at 135 W. 23rd St., where the explosion occurred. Officials described the injuries as minor, except one which is being treated as serious. 。

Although the New York City Police Department had yet to confirm the cause of the explosion, that didn't stop Trump from talking about the emergency during a rally in Colorado Springs. 。

"Just before I got off the plane, a bomb went off in New York and nobody knows exactly what’s going on, but, boy we are really in a time. We better get very tough, folks," said Trump, who allegedly was briefed in his jet before arriving at the rally.。

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"It’s a terrible thing that’s going on in our world and in our country and we are going to get tough and smart and vigilant," Trump added. "We’ll see what it is. We'll see what it is.” 

Twitter vilified Trump, accusing him of inciting fear and noting the difference between his claims and the statements of New York City officials and local news reports.。

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CNN reported that law enforcement officials said a gas leak had been ruled out as the cause of the reported explosion, and that it could have been caused by a device put in or near a dumpster.。 UPDATE: Sept. 18, 2016, 11:24 p.m. ET。

New York City officials livestreamed the press conference relating to the event. The Mayor's office have said "The investigation is ongoing. Though we believe this was an intentional act, there is no credible terror threat against NYC at this moment."。

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UPDATE: Sept. 18, 2016, 1:19 a.m. ET。

NYPD are investigating a second possible device on 27th and 6th Avenue, asking nearby residents to avoid their windows.。

Officials have told news outlets that the second device appears to be a pressure cooker. A police robot has been sent in to inspect it. 。

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UPDATE: Sept. 18, 2016, 11:12 a.m. ET。

New York Governor Andrew Cuomo told reporters that this was "obviously an act of terrorism." He did not, however, name which person or group might have been behind it. 。