A pickup driver killed eight people in New York on Tuesday, mowing down cyclists and pedestrians, before striking a school bus in the city's first deadly attack blamed on terror since September 11, 2001.

Eleven others were seriously hurt when the truck driver struck in broad daylight just blocks from the 9/11 Memorial, on the West Side of Lower Manhattan, close to schools as children and their parents geared up to celebrate Halloween.

"This was an act of terror and a particularly cowardly act of terror aimed at innocent civilians, aimed at people going about their lives who had no idea what was about to hit them," said Mayor Bill de Blasio.

Television networks identified the 29-year-old as an Uzbek citizen living in Florida who had recently been staying in New Jersey, where the truck was rented. President Donald Trump denounced him as "very sick" and a "deranged person."

Confronting what could be the most serious terror-related incident since taking power less than a year ago, the Republican commander-in-chief announced that he had ordered the Department of Homeland Security to step up his "extreme vetting program" on foreign travelers to the country.

The United States "must not" allow Daesh militants to "return, or enter" the country after being defeated overseas, Trump said, albeit as New York officials declined to link the assailant to a specific group.

Police said he drove a rented Home Depot pickup down a bike and pedestrian lane, where tourists and New Yorkers were out enjoying brilliant fall sunshine, at 3:05 pm (1905 GMT), before colliding with a school bus, wounding two adults and two children.

The suspect then exited the vehicle brandishing weapons that were subsequently identified as a paintball gun and pellet gun, before being shot in the abdomen by a police officer and taken into custody, police said.

Television footage showed the mangled wreckage of the pickup truck, bicycles crushed to smithereens and bodies wrapped in sheets and lying on the ground.

Eight people were killed, six of them men who died on the spot and two others pronounced dead in hospital. Eleven other people were taken to hospital with serious, but not life-threatening injuries, officials said.

Argentine citizens were among the dead, but Buenos Aires did not immediately confirm how many. La Nacion newspaper said there were five Argentine victims. Belgium said one of its citizens was killed and that three others were wounded.

European allies and Mexico's president condemned the attack. "Together we will defeat the evil of terrorism," said British Prime Minister Theresa May. French President Emmanuel Macron tweeted: "Our fight for freedom unites us more than ever."

Television networks named the perpetrator as Sayfullo Saipov, of Tampa, Florida. According to registry site WhitePages, a 29-year-old of the same name has been living in Tampa since June 2011, and had other addresses registered in Ohio.

US media said the suspect shouted "Allahu Akbar" and police chief James O'Neill confirmed that he made a statement when he exited the vehicle.

"If you just look at the M.O. of the attack, that's consistent with what's been going on. So that along with the statement has enabled us to label this a terrorist event," O'Neill said.

He was later operated on and was expected to survive, US networks reported.

Source: Khaleej Times