Workers show medical emergency measures during a drill in Tokyo, capital of Japan, on March 11, 2013. A drill to take precautions against natural calamities including medical emergency and fire fighting drills was held here to mark the second-year anniversary of the March 11 earthquke and ensuing tsunami that left more than 19,000 people dead or missing and triggered a nuclear accident the world had never seen since 1986. [Photo/Xinhua]