Four Allegheny County police officers were promoted and began work in their new capacities Wednesday.

Lt. Richard Mullen of West Mifflin, an 18-year veteran of the force, was promoted from sergeant and will be stationed at Pittsburgh International Airport. Also stationed at the airport will be Lt. Andrew Schurman, a 17-year veteran from Pine, formerly a sergeant in the homicide squad.

Officers Andrew Pszenny of Franklin Park and Michael Peairs of Elizabeth Township were elevated to sergeant. Sgt. Pszenny, who has more than four years on the force, will work out of North Park; Sgt. Peairs, a 10-year veteran, will serve at the airport.

The group was honored at a short ceremony Wednesday morning in the Gold Room of the Allegheny County Courthouse.

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