In September 2001 , the Arlington County P.D. responded to the Pentagon after terrorists attacked it during the September 11 attacks , as the building is located in the county . Since the establishment of the Arlington County Police Department , 7 officers have died in the line of duty , the most recent in 2016 as a result of an illness caused by the September 11 attacks of 2001
September 11 attacks
September 11 attacks
Arlington County Police Department