NEW YORK (TheBlaze/AP) -- Gov. Andrew Cuomo said Sunday a blast that injured 29 people in Manhattan was caused by some kind of bomb, but the attack didn't appear to be linked to international terrorism.
Cuomo, speaking near the scene of the Saturday night blast, told reporters a second device found blocks away from the first explosion appeared "similar in design" to the first, though investigators are still testing its remnants after it was removed by a bomb squad robot and blown up at a police facility in the Bronx.
The bombing rocked the city's Chelsea neighborhood, a mostly residential part of Manhattan's west side known for its art galleries and large gay population. Witnesses described hearing a deafening blast, and surveillance video footage captured images of nearby windows being blown out by the explosion as people sprinted away from the scene.
"We will find whoever planted these explosives and they will be punished," said Cuomo, a Democrat. He said all 29 people who were injured have been treated and released from a hospital.
[sharequote align="center"]"We will find whoever planted these explosives and they will be punished."[/sharequote]
Members of the FBI's Joint Terrorism Task Force are investigating the blast along with New York Police Department detectives, fire marshals and other federal investigators. As a precaution, Cuomo said he was deploying an additional 1,000 state troopers and members of the National Guard throughout New York City.
The first device, which exploded on West 23rd Street at about 8:30 p.m., appeared to have been caused by an improvised explosive device placed inside a toolbox in front of a building undergoing construction, according to a law enforcement official who spoke to The Associated Press on condition of anonymity because the official wasn't authorized to discuss an ongoing investigation.
The second device, found later inside a plastic bag on West 27th Street, appeared to be a pressure cooker with wiring and a cellphone attached to it, the official said. A spokesman for the Bureau of Alcohol, Tobacco, Firearms and Explosives in New York said investigators are examining the remnants of the device to determine how it was comprised, including whether it was real or fake.
Investigators were also probing whether the Manhattan blast was in any way related to a pipe bomb explosion in Seaside Park, New Jersey, before a charity 5K race to benefit Marines and sailors earlier Saturday. The race was canceled and no one was injured.
Mayor Bill de Blasio, speaking at the scene of the explosion Saturday night, said that there didn't appear to be a connection between the two incidents. He called the explosion an "intentional act" but said there was no known "specific and credible threat against New York City."
"Now, I want to be clear: Whatever the cause, whatever the intention here, New Yorkers will not be intimidated," he said.
This story has been updated.