The Prime Minister spoke to the Chief Minister about the steps being taken to restore peace in the areas which have witnessed violence, a PMO statement said.
"The Prime Minister condemned the violence and expressed grief and shock over the loss of innocent lives," it said.
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Singh assured Yadav that the Centre will extend all required assistance to the state government in tackling the situation, the statement said.
Curfew has been clamped in riot-hit areas of Muzaffarnagar and the Army has staged flag marches there to restore order.