Venezuela ? Gunmen opened fire on students returning from a march Wednesday in which 80,000 people denounced President Hugo Chavez’s attempts to expand his power. At least one person was killed and six were wounded, officials said.

Photographers for The Associated Press saw at least two gunmen – one wearing a ski mask and another covering his face with a T-shirt – firing handguns at the anti-Chavez crowd at Central University in Caracas. Terrified students ran through the campus as ambulances arrived.

National Guard troops gathered outside the campus, Venezuela’s largest and a center for opposition to Chavez’s government. Venezuelan law bars state security forces from entering the campus, but Luis Acuna, the minister of higher education, said they could be called in if the university requests them.

Antonio Rivero, director of Venezuela’s Civil Defense agency, told the local Globovision television channel that one student was killed and at least two were injured by gunfire. He said four other students suffered other injuries.