Five were killed and six injured in double...

Earlier reports said there was only one explosion. The first blast occurred at 08.45 Moscow time [04:45 GMT], and the other came twenty minutes later.

Two of the men killed were members of the Russian police force.

"One policeman died immediately and the other on the way to hospital," the source said.

The explosions occurred some 300 meters from the buildings of the Interior Ministry, Federal Security Service and a school.

"According to preliminary information, a Niva car stuffed with explosives blew up. When police and emergencies services came to the site, a second blast went off," the source added.

MAKHACHKALA, March 31 (RIA Novosti)