China is actively preparing for a possible radioactive threat following a massive quake and tsunami in Japan and explosions at the Fukushima Nuclear Power Plant, Chinese Foreign Ministry spokeswoman Jiang Yu said on Tuesday. Blasts at the Fukushima 1 NPP in northeastern Japan have escalated concerns about a possible nuclear disaster in the country devastated by a powerful 9.0-magnitude earthquake and subsequent tsunami. Jiang said that special bodies responsible for the environment in China "demanded to tighten monitoring of the radioactive situation so to effectively hold essential preparations to counter [the possible worsening of the situation]." Air China has also canceled its flights to Japan until March 19 following the disasters.