Police are investigating a threat to a Gettysburg parade. The threat was mailed to 'The Gettysburg Times' this week and was focused on the annual Remembrance Day parade tomorrow. Police are increasing their presence at the event by five times the amount of officers and the parade route is being changed and shortened. Attendees are also asked to leave backpacks at home. The parade begins at 1:00 p.m. at the middle school.