A former U.S. Capitol Police officer was sentenced to five years in prison on Thursday after being found guilty of possessing and distributing child pornography.

A four-month-long investigation conducted by the FBI and the Manassas, Va., police department revealed that former Capitol Police officer Sgt. Dennis Bell, 55, had been trafficking in child pornography over the Internet using several computers found with hundreds of illicit images and videos in his Virginia home, according to Manassas police and court documents.

After being arrested in April, Bell retired from the Capitol Police, where he had worked for 27 years. Bell worked in the department’s communications division. He pleaded guilty to the charges in August.

A similar incident occurred four years ago when Capitol Police Sgt. Michael Malloy was arrested for enticing a girl under the age of 16 to engage in sexually explicit conduct to produce child pornography. In 2008, Malloy was sentenced to 15 years in jail.