Security forces have launched a counterterrorism operation against suspected militants in Russia's volatile North Caucasus Republic of Daghestan.
Local law-enforcement officials say the suspects opened fire when security troops tried to search a house in Daghestan's western city of Khasavyurt on April 24.
They say a woman who emerged from the building and started shooting was killed at the scene.
A gun battle is continuing with at least two more people inside.
Based on reporting by Interfax and ITAR-TASS