The coast guards of Japan, Indonesia and the Philippines took part in a mock oil spill exercise in southern Philippine waters on Wednesday.

The drill was part of the four-day Regional Maritime Pollution Exercise that kicked off Tuesday to address such pollution, especially that caused by oil spills.

Teams from the three countries responded to a mock collision between a passenger vessel and a tanker in the Davao Gulf in which 1 million liters of oil was assumed to have been spilled.