CALGARY—A new year dawned in Calgary with the death of a veteran city police officer during a routine traffic stop and two young men in custody on charges of first−degree murder. The death of 37−year−old Sgt. Andrew Harnett touched off an outpouring of grief across the city Friday, as well as a manhunt for those who police believe were responsible for the New−Year’s−Eve hit and run. “Today is the day that I have had nightmares about,” Calgary police Chief Mark Neufeld told a news conference. “I’m pissed off. It’s totally senseless.” Police said Harnett had pulled over an SUV in the city’s northeast shortly before 11 p.m. Thursday, after noticing plates on the vehicle did not match its registered description. Neufeld alleged the vehicle took off, hitting the officer and dragging him down the road. A second unrelated vehicle was also involved and “may have come into contact” with Harnett …