Chinese coast guard ships fired water cannons and blocked and rammed a Philippine fisheries vessel on Sunday in the disputed South China Sea.

China and the Philippines blamed each other for the tense confrontations in the high seas off Sabina Shoal, which has become a new flashpoint, where both have deployed coast guard ships on suspicion that either one may take steps to seize the uninhabited atoll.

The Chinese coast guard said it took action against a Philippine vessel, which entered waters in the vicinity of Sabina and ignored warnings, leading to a minor collision.

Chinese coast guard spokesperson Gan Yu said the Philippine ship sailed toward the Chinese coast guard ship “unprofessionally” and “dangerously”, causing the two vessels to brush against each other.

The Philippine vessel had journalists onboard to take pictures to “distort facts”, he said.

“The responsibility is totally on the Philippines’ side. We sternly warn that the Philippine side must immediately stop the infringement and provocation, otherwise it must bear all consequences,” Mr Gan said without elaborating on the control measures that the Chinese side employed.

A Philippine government taskforce said a vessel of the Bureau of Fisheries and Aquatic Resources, the BRP Datu Sanday, “encountered aggressive and dangerous manoeuvres from eight People’s Republic of China maritime vessels” while cruising to Sabina, causing its engine to fail and hampering its effort to provide diesel, food and medical supplies to Filipino fishermen.

The Chinese coast guard ships, which were backed by a navy ship, “made close perilous manoeuvres that resulted in ramming, blasted horns and deployed water cannons against the BFAR vessel”, endangering its crew, according to the Philippine task force, which oversees the territorial disputes.

“The Philippine government calls on the People’s Republic of China to halt these provocative actions that destabilise regional peace and security,” the taskforce said, adding that the Philippines would continue to assert its rights.

The United States expressed its support for the Philippines, its oldest treaty ally in Asia.

US ambassador MaryKay Carlson said in a statement posted on X that China’s actions were “unsafe, unlawful and aggressive”, and “disrupted a legal Philippine mission, endangering lives — the latest in multiple dangerous actions”.

China is rapidly expanding its military and has become increasingly assertive in pursuing its territorial claims in the South China Sea, which Beijing claims virtually in its entirety.

The tensions have led to more frequent confrontations, primarily with the Philippines, though the long-time territorial disputes also involve other claimants, including Vietnam, Taiwan, Malaysia and Brunei.