MOSCOW -- Three members of Russian security forces and four gunmen were killed in a shootout in southern Russia on Wednesday during a sweep for militants before the Sochi Winter Olympics, authorities say.

Russia's National Anti-terrorism Committee (NAC) said the dead gunmen included a man accused of carrying out a car bomb attack in the city of Pyatigorsk late last year that killed three people.

Russia in on high alert following two suicide bombings in southern Russia last month that fueled security concerns before the Olympics. A top rebel leader in the North Caucasus has called on his followers to attack the Olympics.

President Vladimir Putin has staked a lot of personal and political prestige on the success of the Games, which open on Feb. 7, and has put security forces on combat alert in Sochi.

The NAC said in a statement that a group of militants had been trapped in a house in the village of Karlanyurt in the volatile Dagestan region of the North Caucasus. Five officers were also wounded in what a spokesman called a special operation.

Dagestan's capital, Makhachkala, is about 385 miles east of Sochi. The mostly Muslim region is plagued by bombings and shootings that mainly target police and state officials as part of the militants' fight to create an Islamist state.

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