21.   The trouble erupted when protesters marched on a jail where two leaders of Jewish West Bank settlers had been held.

22.   The trouble erupted after Israel opened a tunnel near the Muslim holy sites in Jerusalem.

23.   The trouble has erupted sporadically ever since.

24.   The troubles erupted after a NATO-led bombing campaign forced former Yugoslav President Slobodan Milosevic to end his crackdown against ethnic Albanians in Kosovo.

25.   Trouble erupted on Friday when Muslims, angered by pamphlets denigrating their religion, attacked the Hindus after noon prayers.

26.   Trouble first erupted Friday, when Croat civilians blocked roads and prevented Muslim refugees from returning.

27.   Trouble erupted as soon as the session opened.

28.   Trouble first erupted on Friday, when Croat civilians blocked roads and prevented Muslim refugees from returning.

29.   France moved heavily armed troops in to prop up the regime after trouble erupted last Saturday, evacuating foreign nationals.

30.   He said his son was taking his regular English-language class at the main campus when the troubles erupted.