Delhi Police has conducted massive mock security drills last night across the city ahead of New Year's eve. During the drills, a number of prominent malls and shopping complexes, including DLF Promenade and Ambience Mall in south Delhi's Vasant Kunj were evacuated. <br/><br/>The police officials said, the drills were held to enhance the preparedness ahead of New Year's eve to deal with any potential threats. It said the joint commissioners of all police ranges in the city were instructed in advance and the entire operation was carried out under the supervision of Special Police Commissioner.