BEIJING, China (CNN)  -- A U.S. surveillance ship violated Chinese and international laws during patrols more than 100 miles (160 kilometers) off the Chinese coast over the weekend, China's state-run media reported Tuesday. The Navy says this photo shows two Chinese trawlers forcing the Impeccable to make an emergency stop. "China has lodged serious representations with the United States, as the USNS Impeccable conducted activities in China's special economic zone in the South China Sea," said Ma Zhaoxu, a Chinese Foreign Ministry spokesman. "We demand that the United States put an immediate stop to related activities and take effective measures to prevent similar acts from happening."
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China says U.S. surveillance ship conducted activities in a "special economic zone"
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China demands U.S. take measures "to prevent similar acts from happening"
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Pentagon says Chinese ships harassed USNS Impeccable in international waters
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Chinese crew tried to snag Impeccable's equipment in water, Pentagon says
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During the incident, five Chinese vessels "shadowed and aggressively maneuvered in dangerously close proximity to USNS Impeccable, in an apparent coordinated effort to harass the @placeholder ocean surveillance ship while it was conducting routine operations in international waters," the Pentagon said in a statement.
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Ma said that "the @placeholder claims are gravely in contravention of the facts and confuse black and white and they are totally unacceptable to China," although he didn't say what China's version of the events were.
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According to the Pentagon, the Chinese crew members aboard the vessels, two of which were within 50 feet, waved Chinese flags and told the @placeholder ship to leave the area.
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"The @placeholder crew members disrobed to their underwear and continued closing to within 25 feet."
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After the @placeholder alerted the Chinese ships "in a friendly manner" that it was seeking a safe path to depart the area, two of the Chinese ships stopped "directly ahead of USNS Impeccable, forcing Impeccable to conduct an emergency 'all stop' in order to avoid collision," the statement said.