Trouble erupted at the Visva Bharati campus in West Bengal's Birbhum district on Monday as a large number of people ransacked the university's properties protesting the construction of a boundary wall at the Pous Mela ground. Sources said that the university authorities had decided to fence the ground where the 'Pous Mela' annual winter fair is held and construction work started in the morning. Around 4,000 people assembled near the campus in Santiniketan and then entered ransacking some properties and pulling down one of the university gates using a JCB machine, the sources said.