Why was the 1996 World Cup Semifinal victory ‘awarded’ to Sri Lanka?

Why was the 1996 World Cup Semifinal victory ‘awarded’ to Sri Lanka?

The 1996 championship was held in Indian subcontinent for a second time, with the inclusion of Sri Lanka as host for some of its group stage matches. In the semi-final, Sri Lanka, headed towards a crushing victory over India at Eden Gardens (Calcutta) after their hosts lost eight wickets while scoring 120 runs in pursuit 254. Sri Lanka was awarded victory by default after riots broke out in protest against the Indian performance. Sri Lanka went on to win their maiden World Cup championship at Lahore, by defeating Australia in the final by seven wickets.