The U.S. Federal Bureau of Investigation and police in New York were still searching Monday for suspects and possible links between a bomb that exploded Saturday night in Manhattan and another found nearby.
Authorities stopped a "vehicle of interest" on a highway in the Brooklyn section of New York late Sunday, and the FBI said it questioned five people inside, but that no one had been charged with any crime.
The blast Saturday in the Chelsea neighborhood wounded 29 people, all whom have been released from the hospital.
The second device, recovered a short time after the first went off, involved a pressure cooker with a cell phone attached to it. Police were able to safely remove it from the area and said Sunday they blew it up in a controlled explosion.
FBI technicians are examining evidence from both of the bombs at a lab near Washington.
CNN also cited multiple law enforcement sources saying a man was seen on surveillance footage at both bomb sites.
Many questions remain
New York City Mayor Bill de Blasio cautioned Sunday a lot of work remains to figure out the motivation behind the bombing.
"Was it a political motivation, a personal motivation, what was it? We do not know that yet," he told reporters.
New York Governor Andrew Cuomo called the blast an "act of terrorism," but said there was no evidence of "international terrorism."
Cuomo also said an extra 1,000 police and National Guard troops would patrol the New York subway system as a precaution.
Both leaders also said there was no evidence yet linking the New York bombs with a pipe bomb that exploded Saturday morning in a trash can in a New Jersey beach town 135 kilometers south of the city. No one was hurt in that blast.
Authorities found another suspicious device late Sunday at a New Jersey train station located just outside New York. They suspended rail service in that area while they investigated, and it was too early to know if it had any connection with the other incidents in the region.
Busy time in NYC
New York is especially busy with hundreds of world leaders and dignitaries visiting this week for the U.N. General Assembly.
U.N. spokesman Stephane Dujarric told VOA that officials assess security needs inside the U.N. complex on a daily basis.
"Outside of the gates, we are in the hands of the host country, at the federal and local levels,” he said. “We appreciate their work and, no doubt, they are doing their utmost to keep everyone safe,” he added.
Chelsea resident Michelle Katz told VOA she was in bed when something sounded "like a bomb exploding or a truck driving into a building." Two minutes later, "there were endless sirens," Katz told VOA.
Another witness, Denise Coles, said the bomb went off as she was pulling into a parking place. "I turned the car off and that's when we heard the explosion. It was like you could feel it inside of you. I looked down the block and I saw the smoke coming out."
"We're fortunate that this didn't happen during the week, like a work day, a Monday or Tuesday," said Steven Faria, who works at a nearby veterans' hospital. "With all the people that work in this area, I think the casualties would have been twice as many people."
VOA reporters Margaret Besheer, Esha Sarai, Ramon Taylor, Steve Herman, and Celia Mendoza contributed to this report from New York.
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