(Portland, OR) -- A memorial ceremony was held Tuesday at the Portland Police Memorial in Waterfront Park. It featured the Portland Police Honor Guard, Portland Police Highland Guard, a 21-gun salute, and a water display from the Portland Fire Boat. Chief Bob Day presented a flag to the mother of Officer Thomas Jeffries who was killed in the line of duty on July 21st, 1997. Since 1870, 29 Portland Police officers and two police canines have been killed in the line of duty.