The annual Wanan air defense exercise is to be held in several locations across Taiwan from today to Thursday, with civilians required to shelter in place when alarms sound, the Ministry of National Defense said. Air raid sirens are to sound at 1:30pm to signal the start of 30-minute drills today in northern Taiwan, tomorrow in central Taiwan, Wednesday in southern Taiwan and Thursday in eastern Taiwan and outlying counties, it said. Northern Taiwan covers Taipei, New Taipei City, Keelung, Taoyuan, Hsinchu county and city and Yilan County. Central Taiwan comprises Taichung, Chiayi county and c...