21.   Before the vote, several dozen leftist students threw eggs and paint at the opposition headquarters.

22.   Early in the campaign, leftist students threw garbage at Castillo.

23.   Early on Sunday a half dozen students threw stones at several police-manned barricades before being dispersed.

24.   Fire swirled from the building as police fought their way through a shower of firebombs and rocks thrown by students perched on the roof.

25.   Her parents said their daughter had transferred to the Catholic school to escape harassment at another school where students had thrown stones at her, but problems persisted.

26.   Hundreds of anti-riot police entered the campus when students threw stones at officers.

27.   In another city, students threw firebombs at a police station, Yonhap said.

28.   In La Paz, several hundred students threw stones at police who responded with tear gas in the second straight day of clashes.

29.   In some cases, students throw questions that appear on the tests to their friends and relatives outside the classroom.

30.   In two other cities, angry students threw dozens of firebombs at a police station and at the district chapter office of the ruling party, reports said.