Unknown gunmen have opened fire on students protesters in the Venezuelan capital, Caracas.
The men, mostly wearing masks, confronted students after a peaceful demonstration against planned constitutional changes proposed by President Hugo Chavez.
The two groups clashed, leaving at least eight people injured, one of them from gunfire.
It is not clear how the violence first erupted, but a number of gunmen entered the campus of the Central University of Venezuela on motorbikes.
Angry students threw rocks at a building where the gunmen were hiding.
They also set fire to benches and threw firebombs.
The students were protesting constitutional reforms being put to a referendum next month.
Among the changes are amendments to abolish presidential term limits, and to give the president control over the Central Bank.