At least 14 people have been killed and scores injured in violent protests in Kathmandu against alleged government corruption and a new social media ban, state TV reported.
Police fired live ammunition, tear gas, water cannons and rubber bullets as thousands of young demonstrators tried to storm parliament.
Protesters pushed through barbed wire and forced riot police to retreat as they surrounded the parliament building.
Police were outnumbered and sought safety inside the parliament complex, before eventually opening fire.
The army has been deployed, and a curfew has been imposed around the Prime Minister's residence and government precinct.
The unrest follows Nepal's move last week to block access to platforms including Facebook, after companies failed to register with authorities i