Law enforcement officials are still investigating what, exactly, led a man to drive down a Lower Manhattan bike path for 20 blocks, crash his truck into a school bus, and emerge brandishing paintball and BB guns.

In a press conference held just two hours after the incident — which killed eight and injured a dozen more — New York Police Commissioner James O’Neill repeatedly declined to answer reporters’ questions, saying that it was far too early in the investigation to know all the answers. But he did confirm that law enforcement officials are officially treating the incident as an act of terror, and the suspect is in custody.

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