The United Nations has expressed concern over the deadly clashes between Hindus and Muslims in Indian capital New Delhi.

At the regular briefing at UN Headquarters in New York, Secretary-General's Spokesman, Stephane Dujarric underscored the need for the Indian forces to show restraint and allow the protestors to demonstrate peacefully.

At least thirteen people have so far been killed and a mosque also set on fire by Hindu mobs during protest demonstrations against the controversial citizenship law.