A peaceful Monday night in Coronado Shores was broken by the wail of police-car and fire-truck sirens after a man and woman were stabbed in an apartment. Investigators said 911 operators got a call shortly before 9 p.m. from the front desk of one of the high rises about a stabbing incident. Responding officers found two victims in the lobby of 1773 Avenida Del Mundo: a man and woman age 69, both of whom had been stabbed in the neck.