MAKHACHKALA, June 10 (RIA Novosti) - One police officer died when gunmen opened fire on a police convoy overnight in Russia's North Caucasus republic of Daghestan, a law enforcement spokesman said.

The attack occurred when police in Daghestan's Kizlyar district tried to stop a vehicle for a document check. "They came under fire from the car. One police officer died," the spokesman said.

The incident came a day after Russian President Dmitry Medvedev attended a Russian Security Council meeting in Daghestan following the killing of Daghestani Interior Minister Adilgerei Magomedtagirov.

Magomedtagirov, 52, was assassinated on Friday afternoon at a wedding reception in the capital, Makhachkala. He was shot in the heart and died in hospital without regaining consciousness.

Medvedev said the situation in the North Caucasus remains complicated, with 308 terrorism-related crimes committed since the start of the year, and said the assassination posed a challenge to the state.

In a separate incident on Tuesday night, a group of militants opened fire on police buildings in the Karabudakhkent district and the neighboring village of Kakashura. No police casualties were reported in the attacks.

Police have launched an operation to locate the militants. "The forces are preparing to start an operation against the militants who carried out two assaults in the district this night," a spokesman for the Interior Ministry said.