The Philippine military on Tuesday blamed China for the collision of two Chinese navy and coast guard ships while trying to drive the Philippine coast guard and fishermen from a disputed shoal in the South China Sea.

Footage shows a Chinese coast guard vessel chasing a Philippine boat and then ramming a Chinese warship. It was the latest confrontation in the contested waters.

The Philippines said it’s “seriously concerned” with the “dangerous maneuvers” of Chinese vessels this week and called out Beijing for its “unlawful interference” with a routine humanitarian operation.