The Philippines on Monday accused Chinese coastguard vessels of "intentionally" colliding with its vessels on a resupply mission in a disputed part of the South China Sea, as ties deteriorated between the Southeast Asian U.S. ally and Beijing.

The Philippines on Monday accused Chinese coastguard vessels of “intentionally” colliding with its vessels on a resupply mission in a disputed part of the South China Sea, as ties deteriorated between the Southeast Asian U.S. ally and Beijing.

Both sides traded accusations after the latest incident on Sunday, which was the most serious yet in the waters around the disputed Second Thomas shoal, though no-one was harmed.