Russian officials say a group of people tried to force their way into Russia's embassy grounds in Libya and fired shots.
Russian diplomatic sources in Libya say no embassy personnel were injured in Wednesday's attack in Tripoli. They say the attackers opened fire and tore down the Russian flag.
The sources say the situation is now under control.
The reason for the attack was not immediately clear. But reports say the attackers were apparently reacting to the killing of a Libyan military officer. Sources say a Russian woman was allegedly involved in the killing.
The incident was one of several attacks on diplomatic missions in Libya.
In April, an explosion at the French embassy in Tripoli wounded two guards and caused extensive damage. Libya called that attack a "terrorist" incident.
A terrorist attack on the U.S. consulate in Benghazi on September 11, 2012 killed the U.S. ambassador and three other Americans.
Libya has struggled with instability and violence since the ouster of long-time dictator Moammar Gadhafi in late 2011.