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 U.S. deployed two warships Wednesday to a disputed South China Sea shoal where two Chinese ships collided earlier in the week while trying to drive away a smaller Philippine ship in a high-seas incident that raised alarms about maritime safety.