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What we know about the New York attack

Eight people were killed and about a dozen were hurt Tuesday when a 29-year-old man drove a rental truck into crowd, mowing down pedestrians and cyclists in what officials are calling the deadliest terror attack in New York City since 9/11.

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Nicole Chavez (CNN)
(CNN) — Eight people were killed and about a dozen were hurt Tuesday when a 29-year-old man drove a rental truck into crowd, mowing down pedestrians and cyclists in what officials are calling the deadliest terror attack in New York City since 9/11.

Here's what we know -- and don't know -- so far.

What happened?

What we know:

A man drove a rented truck around 3:05 p.m. onto the West Side Highway bike path in New York's lower Manhattan, hitting bicyclists and pedestrians. About a mile down the path, the truck collided with a school bus, injuring two adults and two children. The driver, identified by two law enforcement sources as Sayfullo Habibullaevic Saipov, exited the truck with a pellet gun and a paintball gun. A police officer shot him in the abdomen. One official said Saipov followed ISIS instructions "for carrying out such an attack" almost to the letter. The terror group has posted instructions on its websites and on social media.

What we don't know:

What was the attacker's motive? Police say Saipov has been somewhat cooperative, but what is he telling them?

The victims

What we know:

Hernán Diego Mendoza, Diego Enrique Angelini, Alejandro Damián Pagnucco, Ariel Erlij and Hernán Ferruchi were killed while celebrating the 30th anniversary of their graduation from their high school in Rosario, Argentina. A Belgian mother of two, Anne-Laure Decadt, was also killed, according to her husband. She was traveling with her sisters and mother at the time of the attack. Also killed were Darren Drake, 32, of New Milford, New Jersey, and Nicholas Cleves, 23, of New York, said a source with knowledge of the investigation. Another Argentine who was part of the group was injured in the attack, as was a German woman who was not with the group. Two victims died at Bellevue Hospital. Of the injured, nine remain hospitalized. Four of those are in critical but stable condition, officials said. Injuries included a bilateral amputation and trauma to the neck, head, chest and back.

The police officer

What we know:

His name is Ryan Nash, 28. He was "on post near the location" at the time of the attack and apprehended Saipov, Police Commissioner James O'Neill said He's been with the New York Police Department since 2012 and works in the city's 1st precinct. O'Neill says he "stopped the carnage" by shooting Saipov in the abdomen. "He was so humble about his achievement, it was very striking," Mayor Bill de Blasio said.

What we don't know:

Whether Nash is one of the officers with whom Saipov spoke after he was shot, and if so, what did Saipov tell him?

The suspect

What we know:

Saipov has been linked to social media accounts containing ISIS-related material, and a note found near the truck used in the attack claimed the action was taken in the name of the terror group, authorities say. The crux of the note, one official said, is that ISIS will endure forever. Saipov came to the United States in 2010 from Uzbekistan. He apparently spent time in Florida at some point. Investigators plan to search the crime scene again today, including his car that is parked at a Home Depot where he rented the truck used in the attack. There was a phone found at the crime scene that investigators believe belongs to the suspect. They are reviewing its contents. The 29-year-old recently lived in New Jersey and worked as an Uber driver there in the past six months, the company told CNN. Uber says he passed a background check and the company received no complaints about him. He was once arrested in Missouri for failing to appear in court on a misdemeanor charge. He posted bond and failed to appear again in November 2016. He married Uzbek national Nozima Odilova, 19, in Cuyahoga Falls, Ohio, in 2013. He has three children, according to multiple law enforcement officials. He registered two companies in Ohio, in 2011 and 2013. He underwent surgery Tuesday. Investigators have spoken with his wife and she is providing them with information, multiple law enforcement officials said. Charges will likely be leveled against him later Wednesday.

What we don't know:

What exactly is Saipov's connection to ISIS, if there is one? Evidence suggests the suspect acted alone, but authorities said it was "all very preliminary." Why did Saipov move to the US? He listed his occupation as a truck driver on his marriage license, but we don't know much about his previous employment. How he was "radicalized domestically," per the claim from New York Gov. Andrew Cuomo.

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