NEW YORK  — Investigators scrambled to find out who planted a bomb that rocked a bustling New York City neighborhood and why Sunday, scouring shrapnel, forensic traces and surveillance video for any link to an unexploded pressure-cooker device found a few blocks away.

There seemed to be more questions than answers hours after the Saturday night blast that injured 29 people in Manhattan. All of them have since been released from the hospital.

"We just know there was a bombing," Mayor Bill de Blasio said at briefing at New York Police Department's headquarters. "That much we do know."

Democratic Gov. Andrew Cuomo, who toured the site of the blast in Manhattan's Chelsea neighborhood, said there didn't appear to be any link to international terrorism. He said a second device found blocks away from the bombing appeared "similar in design" to the first.

That device — described by a law enforcement official as a pressure cooker with wires and a cellphone attached to it — was removed early Sunday morning by a bomb squad robot and is being examined by forensic experts.

Crime scene investigators work Sunday, Sept. 18, 2016, at the scene of Saturday's explosion in Manhattan's Chelsea neighborhood, in New York.

Photo Credit: Craig Ruttle/AP

The official spoke to The Associated Press on condition of anonymity because the official wasn't authorized to speak publicly about an ongoing investigation.

Cuomo on Sunday directed the State Police and National Guard to deploy an additional 1,000 uniformed officers out of an abundance of caution to high-profile locations across the state.

The New York Guard already has soldiers and airmen patrolling transportation hubs across New York City. Joint Task Force Empire Shield regularly patrols the city's busiest transportation sites, including Penn Station, Grand Central Station the PATH terminal linking Manhattan with New Jersey, and LaGuardia and JFK airports, officials have previously said.

JTF Empire Shield has been in place since the Sept. 11, 2001, terror attacks, and the troops augment local authorities across the city.

A pipe bomb explosion in Seaside Park, New Jersey, before a charity 5K race to benefit Marines and sailors earlier Saturday didn't appear to be connected to the Manhattan bombing, and each bomb contained different materials, officials said, but added that they weren't ruling anything out yet. The race was canceled and no one was injured.

The New Jersey device contained evidence of a black powder, while the device that exploded in Manhattan had residue from an explosive called Tannerite, said a federal law enforcement official.

The official wasn't authorized to discuss details of the ongoing investigation and spoke to the AP on the condition of anonymity.

Tannerite is often used in target shooting to mark a shot with a cloud of smoke and small explosion.

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.

Crime scene investigators work at the scene of Saturday's explosion in Manhattan's Chelsea neighborhood, in New York, Sunday, Sept. 18, 2016.

Photo Credit: Craig Ruttle/AP

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.

"It was extremely loud, almost like thunder but louder," said Rudy Alcide, a bouncer at a nightclub near the blast.

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.

Police arrive on the scene of an explosion in Manhattan's Chelsea neighborhood, in New York, Saturday, Sept. 17, 2016.

Photo Credit: Andres Kudacki/AP

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, the law enforcement official said.

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.

Federal investigators in Quantico, Virginia, will examine evidence from the explosions in New York and New Jersey.

Associated Press writers Karen Matthews, Ezra Kaplan and Maria Sanminiatelli in New York and Eric Tucker, Kevin Freking and Alicia A. Caldwell in Washington contributed to this report. Military Times staff writer Michelle Tan contributed to this report.

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