Masked protesters occupy Mexican university offices MEXICO'S largest university has urged masked protesters to leave the school's main office, warning it had asked prosecutors to investigate the takeover of a tower featuring a mural by a renowned artist. A group of around 20 people burst into the president's office late Friday, breaking windows on their way into the building of the National Autonomous University of Mexico, which has a 1950s wall painting by Mexican artist David Alfaro Siqueiros. The young protesters occupied the Rector's Tower to protest the expulsion of five students, who were accused of occupying the Science and Humanities College and attacking UNAM workers in February. The tower is within the Ciudad Universitaria complex, which was inaugurated in 1954 and declared a UNESCO World Heritage Site in 2007. "They should not dare sack the heritage of the nation again," UNAM president Jose Narro told a news conference. Narro said a complaint was filed with the federal prosecutor's office and the names of students who took part in the violence will be handed over to authorities. Some 300 students angry with the building's invasion surrounded the tower and shouted at the protesters, according to local television. UNAM is the biggest university in Latin America with more than 215,000 students, six campuses in Mexico and presences in the United States, Canada and Spain.