11.   Armed pro and anti-independence groups have clashed sporadically in recent weeks.

12.   Before the game, four people were hospitalized when groups of fans clashed outside the stadium.

13.   But the two groups often clash with one another because they are fighting for different causes.

14.   Earlier, violence broke out when a group of youths in masks and crash helmets clashed with riot police and other marchers as they tried to join the demonstration.

15.   Extremists Sunni and Shiite Muslim groups regularly clash in Punjab.

16.   However well-armed militant groups routinely clash.

17.   In some parts of Peru the two groups have clashed openly.

18.   Israel, which claims control over the entire city, has encouraged Jews to move into Arab neighborhoods and the two groups often clash.

19.   Militant group clashes with police.

20.   Outside the legislature, rival groups also clashed briefly.