On Wednesday violence erupted at the University of Caracas, Venezuela when a masked gunmen opened fire on students returning from a march against the Venezuelan President Hugo Chavez.

According to authorities at least two students were shot and a handful of people were taken to the hospital.

The attacked students were returning from a march in which almost 80,000 demonstrators protested in front of the Supreme Court against the changes that the president wants to make in the constitution.

The Venezuelans will have to vote the changes in a referendum on December 2.

One of the changes is the elimination of the presidential limits and the instauration of a socialist reform. It will also give the authorities the power to send people to detention without charges and control the media, in case of national emergency.

According to photographers for The Associated Press there were at least four gunmen who had their faces covered with T-shirts or ski masks and were firing handguns at the crowd. The students run through the campus.

A Reuters witness said the bystanders didn’t know how the violence started.

Chavez supporters arrived on motorcycles later one scaring the students off by firing a handgun in the air.

Demonstrations were also held in the cities of Maracaibo, San Cristobal, Merida, Barquisimeto, Puerto La Cruz and Valencia.

In a television broadcast late Wednesday, Pedro Carreno, Justice Minister, accused the students and media for the violence: “"We want to urge the media to reflect, to stop broadcasting biased news through media manipulation, filling a part of the population with hate,” the Associated Press reports.

Hugo Chavez was elected in 1999 and in 2013 he would have to leave the office.

His plan of changing the constitution has been blamed by opposition parties, the Roman Catholic Church and human rights groups that accuse him for trying to follow Cuban leader, Fidel Castro, trying to stay in power for life.