NYC Man Killed After Axe Attack on NYPD

Investigators search for clues to motive.
1:53 | 10/24/14

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Transcript for NYC Man Killed After Axe Attack on NYPD
And now to the scary scene on the streets here in New York. A man with a hatchet badly injuring two police officers. The attacker was shot dead. And there are questions if he has ties to terrorism. Brian Ross has more. Reporter: Good morning. Coming on the heels of the attacks in Canada, this bizarre incident? New York City is being investigated as terrorism. It seems to be a deranged man obsessed with issues of race. The 32-year-old man was charging with a hatchet in both hands as he prepares to strike. Unprovoked and not speaking a word, the male then swung at one of the officers with the hatchet, striking his right arm. After striking that officer, the suspect continues swinging the hatchet. Striking a second officer in the head, causing him to fall to the sidewalk. Reporter: Two other police officers opened fire, killing the attacker. But also hitting a female bystander. Everybody ran to the store. For safety, running to the store. Reporter: The attacker has been identified as Zale Thompson who's Facebook shows a focus on racial issues around the world and a passage from the Koran. Terrorism could not be ruled out or in. This early on we really cannot say yes or no to that question. Reporter: The officer hit in the head with the hatchet is reported this morning to be in serious but stable condition, robin. As you know, Brian, we have seen similar attacks like this around the world. Australia, England, now Canada. Are authorities concerned they may be copy cat attacks? Very concerned, anybody in uniform, law enforcement, military, is a symbolic target for people with a grievance. High alert. And turn now to a deadly midair collision.

This transcript has been automatically generated and may not be 100% accurate.

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