Story highlights Retired state trooper confronts tollbooth employees with gun, police say

The ex-trooper kills tollbooth employee and security guard, police say

Ex-trooper Clarence D. Briggs, 55, was shot and died at the scene, they say

(CNN) A retired Pennsylvania state trooper was shot and killed after he attempted armed robbery and killed a tollbooth employee and a security guard, the Pennsylvania State Police said.

Clarence D. Briggs, 55, confronted two tollbooth employees shortly before 7 a.m. Sunday at the Pennsylvania Turnpike's Fort Littleton interchange and displayed a handgun, Pennsylvania State Police said in a statement. Briggs ordered the two employees into a nearby building, where he attempted to tie them up.

After a struggle, the two employees escaped as a fare collection vehicle approached the area, according to police. Briggs shot and killed one of the tollbooth employees and a security guard for the vehicle, police said.

Briggs attempted to rob the vehicle after the driver fled, and he tried to unload money into his car that was parked nearby, police said.

Police soon arrived. An exchange of gunfire followed, and a trooper shot Briggs, who died at the scene.

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