A blast killed two policemen in the Russian town of Makhachkala near Chechnya on Tuesday, a police officer at the scene said.
“One other officer and a passerby were injured,” the policeman told Reuters as specialists worked on the site of the explosion behind him.
The blast had targeted a small police station on the edge of Makhachkala, capital of the region of Dagestan which borders Chechnya and is increasingly being sucked into its neighbour’s separatist war.
A bomb claimed by Islamist militants killed 10 soldiers on Friday in the same town as they were on their way to a steam bathhouse, while a member of the local parliament was killed by gunmen on Monday evening.
Islamist rebels have killed dozens of police and officials in the region this year, frequently using car bombs to attack officers whom human rights groups accuse of kidnapping rebels’ relatives to put pressure on the insurgents.