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China's Defense Ministry has denied U.S. accusations that a Chinese fighter jet conducted a "dangerous intercept" of a U.S. Navy surveillance aircraft.

Defense Ministry spokesman Yang Yujun called the U.S. accusations "groundless" in a statement issued Saturday night. Yang said the Chinese pilot conducted operations that were "professional and the Chinese jet kept a safe distance from the U.S. planes."

Yang described the Chinese flights as "routine identification and verification."

Pentagon Press Secretary Rear Adm. John Kirby gave a different account Friday of the Aug. 19 encounter about 135 miles east of China's Hainan Island. He said the Chinese jet made several close passes by the Navy P-8 Poseidon plane, coming within 30 feet of it. He said the Chinese jet did a “barrel roll” maneuver over the top of the Poseidon and also passed across the nose of the Navy plane, exposing the belly of the fighter in a way apparently designed to show that it was armed.

Kirby said the Chinese jet's maneuvering posed a risk to the safety of the U.S. air crew and was "inconsistent with customary international law.

"Not only is it unprofessional, it’s unsafe, Kirby said. He added that Washington has lodged a protest to China through diplomatic channels.

He said it was the fourth such incident since March of "close intercepts" involving Chinese jets.

The Chinese statement also said that a Navy P-3 Orion, an anti-submarine and surveillance aircraft, flew alongside the Poseidon. The Pentagon did not mention the second aircraft.

Tensions between the two countries have risen in the South China Sea, as China disputes territorial claims with U.S. ally the Philippines, Vietnam and other neighbors.

In 2001, a Chinese jet collided with a U.S. Navy surveillance aircraft off Hainan Island, killing the Chinese pilot and forcing the Navy plane to make an emergency landing on the island. Washington severed military relations with China after that episode.

In the latest encounter, Yang blamed "the large-scale and highly frequent close-in reconnaissance by the U.S. against China" as "the root cause of accidents endangering the sea and air military security between China and the United States."

The Associated Press contributed to this report.