Ladakh Director General of Police S D Singh Jamwal on Saturday said activist Sonam Wangchuk is being probed for having links with Pakistan. The police chief accused Wangchuk of being the key person behind Wednesday's violent protest Four protestors were killed when police opened fire at youth who were demanding statehood for Ladakh and inclusion in the Sixth Schedule. He also defended police firing at the protestors, calling it 'self defence' measures taken by the police force