An agent of Guatemala's National Civilian Police and two students were injured in a confrontation July 30 between riot police and students outside the Teachers School for Men in the south of Guatemala City; three students and a teacher were arrested for alleged attacks on security forces. The clash came after hundreds of students occupied eight schools, one in the capital and seven in other parts of the country, to protest proposed changes in the national teacher certification program. Security forces prevented the takeover of two other schools. Students also reportedly blocked various highways in the northern and northeastern parts of the country, but apparently without any confrontations with the police. (EFE, July 30)