China’s coast guard said on Sunday it had taken action against a Philippine ship that ignored warnings and caused a minor collision with its vessel in the disputed South China Sea, where confrontations between the two sides have increased.

Coast Guard spokesman Gan Yu said in a statement that the Philippine vessel entered the waters around Sabina Shoal in the Spratly Islands, known in Chinese as Xianbin Reef in the Nansha Islands. Gan said the Philippine vessel ignored the Chinese warning and sailed “unprofessionally” and “dangerously” toward the coast guard vessel, causing the two vessels to collide. He said the Philippine vessel also had journalists on board who took photos to “distort facts.”

“The responsibility lies entirely with the Philippines. We strongly warn the Philippine side to stop the attacks and provocations immediately, otherwise they will have to face all the consequences,” he said. Gan did not elaborate on what control measures the Chinese coast guard had taken.

The Philippine Department of Fisheries and Aquatic Resources said its vessel was subjected to aggressive and dangerous maneuvers by eight Chinese sea vessels. The Chinese actions were aimed at hampering the ship’s humanitarian mission to supply Filipino fishermen with diesel, food and medicine.

China is rapidly building up its military and increasingly pursuing its territorial claims in the South China Sea, which Beijing claims virtually in its entirety. Tensions have led to more frequent confrontations, most notably with the Philippines, although the long-standing territorial disputes also involve other claimants such as Vietnam, Taiwan, Malaysia and Brunei.

The latest incident came days after Chinese and Philippine coast guard vessels collided near the disputed Sabina Shoal atoll. At least two vessels were damaged in Monday’s collision, but no injuries were reported.

Sabina Shoal is located about 140 kilometers west of the Philippine province of Palawan in the internationally recognized exclusive economic zone of the Philippines.

The atoll is located near Second Thomas Reef, another flashpoint where China has hampered supplies to Philippine forces. China and the Philippines reached an agreement last month to prevent further confrontations at Second Thomas Reef.