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"The towed-pinger locator work continues; there have been no further contacts with any transmission and we need to continue for several days right up to the point at which there's absolutely no doubt that the batteries will have expired," Houston said.

Xi left Beijing early Sunday morning for the city of Arxan in Inner Mongolia by plane, which is about 1,000 km away from the Chinese capital.

The new law says that economic and social development should be coordinated with environmental protection and encourages studies on the impact environmental quality causes on public health, urging prevention and control of pollution-related diseases.

In the meantime, a Chinese navy researcher told Xinhua that the drill was not targeted to a third party, but a defense in its nature.

But he made no comment on U.S. reports that the aircraft sent signals to a satellite for four hours after it went missing. He said the international team are currently working on verifying detailed information, but "we have nothing to confirm at this moment."