Police in the Russian North Caucasus republic of Daghestan say one Russian soldier was killed and three police were injured when a man opened fire at a security post late on August 22.
Police said the gunman was shot and killed by police in the violence near the village of Mokok in the Tsuntinsk district.
They said the gunman opened fire from the back of a truck after a vehicle had been stopped for a document check.
Authorities said a search was launched for the driver and other occupants of the truck, which sped away after the shooting.
The Russian Interior Ministry reported earlier on August 22 that between August 11 and 17, nine policemen and soldiers and five civilians in the North Caucasus had been killed in a series of attacks.
Also late on August 22 in Daghestan, police said a police captain was shot by unknown assailants outside his home in the Babayurt area and later died of his wounds.
Based on reporting by ITAR-TASS and Interfax