All four suffered cuts, bruises and blows to the head. University authorities called for help and federal riot police responded. The militant ultras threw rocks and small bombs at the police but they were eventually rounded up and taken away on several buses. Authorities say the arrested strikers will remain in jail while legal proceedings are initiated. Many critics of the government's handling of the UNAM strike have called for the use of public force in reopening the campus, but government officials have rejected that idea.
Some students involved in the strike also blame the confrontation on outside agitators.
Last month, university students, faculty and workers voted overwhelmingly for an end to the strike in a referendum, but the ultras rejected the results and refused to turn over the campus to university officials.