An official says police have opened fire on protesters who were attempting to attack a police station in southern Nepal, killing one.

Government administrator Ram Raja Subedi says at least 18 police officers were injured in the clashes with hundreds of ethnic Madhesi protesters Sunday in Gaur, a town about 160 kilometers (100 miles) south of the capital, Kathmandu.

Subedi says the protesters attempted to attack the police station, throwing rocks, sticks and bottles. He says police first shot tear gas and opened fire in the air, but had to fire on the protesters to contain them, killing one.

The situation in the town was still tense later Sunday.

Ethnic Madhesis have been protesting for months against Nepal's new constitution, demanding the remarking of borders of the newly created provinces.