Officials in Daghestan say they have detained a man suspected of the murder of the head of the local social security office in the settlement of Akusha.
Police said Abdulla Aliyev was shot dead earlier on June 25 at the entrance to the Pension Fund office.
The gunmen fled the scene.
Police said two suspects were spotted at a nearby area some 90 minutes later.
Russian news agencies quoted unnamed police sources as saying one of the suspects was wounded in an exchange of gunfire.
He was detained, while the other fled to a forest.
A police officer was fatally wounded during the gunfire exchange.
He died on the way to hospital.
Based on reporting by Itar-Tass and ria.ru