Story highlights It's still not clear what prompted the shooting

Police have not released a detailed description of the gunmen

(CNN) Police are searching for two men who walked up to a Brooklyn house party and unleashed a hailstorm of bullets, wounding nine people.

Surveillance video captured one of the assailants walking along a residential street early Sunday morning. Even with several pedestrians nearby, he fires several rounds in front of him.

The passers-by panic and flee, one falling face-first onto the street while running away.

It's still not clear what prompted the shooting outside the house.

Immediately after the attack, New York police said 10 people were shot; late Sunday night, they said the number was nine.

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