Hundreds of rebels stormed a police post in eastern Nepal overnight and killed at least nine police officers, officials said Monday.
Police said they had lost contact with another 26 policemen after the attack in the village of Yadukuwa, about 200 miles east of the capital, Kathmandu, and had rushed reinforcements to the area. Rebel casualties were not known.
"Telephone and electric lines have been snapped and the area is out of contact," one official said. "Details of the fighting are sketchy."
Two weeks ago thousands of rebels overran a district capital in west Nepal in an attack in which at least 250 people, mostly rebels, were killed.
Saturday night rebels set fire to more than a dozen trucks waiting at a border post in western Nepal to pick up gasoline supplies from India.
The rebels, fighting to install a republic in place of a constitutional monarchy in the world's only Hindu kingdom, have stepped up attacks on government installations and security posts after they walked out of peace talks last August.