The National Police Agency chief urged Japanese high-tech equipment makers Thursday to be more cautious when exporting to China as their technology could be used to make weapons.

"There is the risk that machines like precision equipment whose exports are subject to regulations (under the Foreign Exchange and Foreign Trade Control Law) can be diverted to develop weapons of mass destruction," NPA Commissioner General Iwao Uruma told a news conference.

"I want those manufacturers to take into account national interests" even though as businesses, they would be inclined to pursue profits, Uruma said in reference to a recent clampdown on makers suspected of having exported products illegally to China.