India's army has taken control of a key canal that supplies water to Delhi, the capital's Chief Minister Arvind Kejriwal has said.
Protesters from the Jat community demanding job quotas in neighbouring Haryana state seized the Munak canal.
Keshav Chandra, a top official in Delhi's water board told the BBC that 10 million people are without water.
Sixteen people have been killed and hundreds wounded in three days of riots, a senior official told the BBC.
