U.S. and state flags across Pennsylvania are flying at half-staff Wednesday in recognition of National Peace Officers Memorial Day.

The day, created by the U.S. Congress, honors the memory of law enforcement officers killed in the line of duty.

The state is paying tribute to the local, state and federal law enforcement officers who provide a vital public service and play an essential role in safeguarding the rights and freedoms of citizens, said Gov. Tom Corbett.

Pennsylvania law enforcement officers who died in the line of duty during 2012 include Ofc. Bradley Fox, Plymouth Twp. Police Dept.; Ofc. Avery Freeman, Chester Police Dept.; and Trooper Blake Coble, Pa. State Police.

The fallen officers' names have also been added to the National Law Enforcement Officers memorial wall in Washington, D.C. They're being honored in the 32nd annual National Peace Officers Memorial Day services at the U.S. Capitol on Wednesday.