Four demonstrators were killed in south-eastern Nepal in clashes over the latest draft of the constitution Wednesday, authorities said.
Police said the protesters were shot dead in clashes during a curfew.
People in the eastern district of Saptari were protesting against the proposed federal system for the country.
Ethnic groups across Nepal have protested, demanding a clearer recognition of their identities and rights.
More than a dozen people including seven policemen have died in protests over the constitution in recent weeks.