MOSCOW, May 14 (RIA Novosti) - At least two of an estimated 10 militants have been killed in a clash with security forces in south Russia in which a Federal Security Service officer also died, a law enforcement source said Thursday.

He said during a clash in a forest 2 km from the village of Endirei in Daghestan's Khasavyurt District, one FSB officer was killed on Wednesday and four personnel were wounded by shrapnel.

He added that at least two of an estimated 10 militants were killed, despite previous reports that almost all of them had been killed.

A Daghestani Interior Ministry official said the operation, which had started on Wednesday, was halted during the night but resumed on Thursday morning.

He added that a large amount of weapons and ammunition had been discovered in a cache nearby.