11.   The clash on Saturday escalated fighting along the frontier, Singh said.

12.   The government and the Moro Front began formal peace talks this year, but clashes have escalated since last week.

13.   There are fears that the clashes could escalate if Serb police fight back.

14.   Those clashes nearly escalated into another full-fledged war between the two countries.

15.   A dozen French mercenaries were reportedly heading to embattled Madagascar on Wednesday, adding to tensions on the Indian Ocean island, where clashes escalated in the north.