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JOHNSON CITY, N.Y. (AP) - Authorities say a man grabbed the service weapon of a police officer responding to a disturbance at an upstate New York business and shot him three times, killing him.

Binghamton Police Chief Joseph Zikuski says Officer David Smith was responding to a reported disturbance at a health care facility in Johnson City on Monday morning when he was attacked.

The police chief says 43-year-old MRI technician James Clark struggled with Smith outside Southern Tier Imaging before grabbing the officer's gun and discharging the weapon's entire magazine.

Smith was an 18-year veteran of the force and died at the scene.

Clark, from nearby Greene, was shot by another officer and died at a hospital.

Zikuski says Clark was described by co-workers as a "model employee." He says a motive is unclear.

(Copyright 2014 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)

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