The 1974 "Nav Nirman" agitation – a protest against a 20% hike in the hostel food fees at the L.D. College of Engineering in Ahmedabad – snowballed into a movement to remove Chimanbhai Patel, then chief minister of Gujarat. In the 1980s, a reservation policy was introduced in the country, which led to anti-reservation protests in 1981 and 1985. The protests witnessed violent clashes between people belonging to various castes. The city suffered some of the impact of the 2001 Gujarat earthquake; up to 50 multi-storey buildings collapsed, killing 752 people and causing much damage. The following year, a three-day period of violence between Hindus and Muslims in the western Indian state of Gujarat, known as the 2002 Gujarat riots, spread to Ahmedabad; refugee camps were set up around the city.