Eight people were killed on Tuesday, and 12 injured when a rented pickup truck plowed down a bike lane that runs along the West Side Highway in Lower Manhattan, officials said. The pickup smashed into a school bus before the driver, Sayfullo Saipov, a New Jersey truck driver who immigrated from Uzbekistan, jumped out and was shot by a police officer, the authorities said.

Law enforcement officials said that as Mr. Saipov ran from the truck, he was heard yelling, “God is great” in Arabic.

What We Know

• Officials called it a terrorist attack, but Gov. Andrew M. Cuomo said at a briefing, “There’s no evidence that suggests a wider plot or a wider scheme.” He said the episode was “the action of one individual who meant to cause pain and harm and probably death, and the resulting terror.” The New York police commissioner, James P. O’Neill, added, “This incident is over.”