Written By: Gianna Buro NEW YORK — Thousands of New York City police officers will begin working mandatory 12-hour tours starting July 1 as the city prepares for one of the busiest and most heavily secured summers in recent memory. NYPD Commissioner Jessica Tisch announced that most uniformed officers will be assigned extended shifts from July 1 through July 7 as part of a heightened security plan surrounding the Fourth of July holiday, international sporting events, and sev