Dagestani experts say that the three servicemen and an investigator have been killed in Makhachkala recently from the same gun, RIA Novosti reports.
Shells found at the death scene of the serviceman on April 11, investigator on February 18, private on February 7 and a serviceman on December 29, 2011, belonged to the same gun.
The law enforcers killed 17 militants, including a leader, and arrested 6 bandits last week. Terrorism threat in Dagestan remains high. Militants committed two crimes in Ingushetia last week. The police expect crime activity in the Easter as well.