At least eight people were killed Tuesday and more than a dozen others were injured when a man drove a rented truck onto a busy bike path in New York City.
"Based on information we have at this moment, this was an act of terror, and a particularly cowardly act of terror aimed at innocent civilians," New York Mayor Bill de Blasio said at a news conference.
New York Governor Andrew Cuomo called it a "lone wolf'' attack, saying there's no evidence to suggest it was part of a wider plot. The incident took place near the World Trade Center memorial in lower Manhattan.
New York Police Commissioner James O’Neill said around 3:05 p.m., a man driving a rented commercial pickup truck entered the bike path, striking riders and pedestrians. The truck also struck a school bus, injuring two adults and two children.
The man then "exited the vehicle brandishing two handguns,” O’Neill said. A paintball gun and a pellet gun were later found at the scene. He was shot in the abdomen by police and taken into custody.
He underwent surgery and is expected to survive.
WATCH: Ramon Taylor reports from the scene
Argentina's foreign ministry said five of its citizens were among those killed. A statement identified them as natives of the city of Rosario, who were in New York with a group celebrating their 30th anniversary of graduating school.
Belgian Deputy Prime Minister Didier Reynders said one Belgian was killed in the attack.
Witnesses describe chaos
For some witnesses, the chaos was reminiscent of images of deadly attacks from across Europe.
"It always seems really distant but then when it’s right next to you, obviously it’s really shocking and disturbing, and you don’t want it to happen to anybody," said Elizabeth Chernobelsky, who witnessed the crime scene.
Others were left in disbelief. College student Jake Saunders, who barely missed a train at a crucial moment, told VOA he considers himself lucky.
"If I had made that train, I would be right where the shooting is, right there, because that was my destination," Saunders said.
Police said the driver shouted "Allahu Akbar,'' Arabic for "God is great," when he got out of the truck. But when O'Neill was asked whether the suspect shouted the phrase, he replied: "Yeah. He did make a statement when he exited the vehicle,'' though he declined to elaborate.
The New York Police Department said they will increase the number of officers throughout the city "out of an abundance of caution."
Law enforcement officials, speaking on condition of anonymity, told media outlets the suspect was was a 29-year-old immigrant from Uzbekistan named Sayfullo Saipov, who entered the United States in 2010.
Uzbekistan's President Shavkat Mirziyoyev said Wednesday the attack was ruthless and cruel, and that his government stood ready to use all means to assist in the investigation.
"We express our feelings of full solidarity to the people of the United States of America," Mirziyoyev said in a statement posted on the Uzbekistan foreign ministry website.
"We strongly condemn the terror truck attack on the innocent civilians in New York City. Our deepest sympathy and condolences to the families who lost their loved ones," said the Turkistanian American Association of New York and New Jersey, on behalf of the Uzbek community, in a statement sent by email to the Voice of America.
The Cato Institute told VOA only about 40,000 Uzbeks have entered the United States as migrants in the last 20 years, of those only two percent arrived as refugees.
David Bier, a policy analyst at the Washington-based think tank, said he believed this is the first time an Uzbek national has killed anyone on U.S. soil in a terrorist attack.
As of March 2017, three Uzbek nationals had been convicted of terrorism offenses. Ulugbek Kodirov who entered as student visa holder in 2008 and later radicalized on the Internet was convicted of threatening to kill President Obama in 2011. Fazliddin Kurbanov who entered as refugee in 2009 attempted to build bombs for an attack in 2013. Abdurasul Juraboev who immigrated after winning the green card lottery in 2011 was convicted of attempting to join ISIS in Syria in 2015.
Trump vows more extreme vetting
In Washington, White House press secretary Sarah Sanders said President Donald Trump had been briefed on the incident and will be continually updated as more details are known. "Our Thoughts and prayers are with all those affected," she said.
Trump later tweeted, "We must not allow ISIS to return, or enter, our country after defeating them in the Middle East and elsewhere. Enough!" Followed by: "I have just ordered Homeland Security to step up our already Extreme Vetting Program. Being politically correct is fine, but not for this!"
Greg Barton, a professor of global Islamic politics at Deakin University in Australia, said it seems as if the attacker was inspired by the Islamic State group.
"Islamic State doesn’t claim attacks when the attacker is held in custody and so they probably won’t claim this one," Barton told VOA. "But there’s no question that we’ve seen many attempted attacks in New York and there will be more attempts in the future.
Barton said stopping radicalization is not hopeless, but will require a multi-step process.
"We need to educate the public, we need to think about putting in physical barriers to limit opportunities for mass carnage with vehicles, we need to be aware of friends and loved ones who might be coming under malign influence, we need to work with society, make people feel more part of society, less alienated and less therefore vulnerable to some cheap approach by a recruiter," he said.
Ramon Taylor in New York and Victor Beattie in Washington DC contributed to this report