US navy drill in South China Sea
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'Hostility' fears over South China Sea disputed waters

23 April 2012 Last updated at 06:34 BST

The number of hostile incidents between maritime forces in the South China Sea has "increased dramatically" in recent years, according to the International Crisis Group.

The organisation says the disputed waters, in areas like the Spratly Islands, are now a major flashpoint for a potential conflict that could draw in both China and the US.

The BBC's John Sudworth reports.