Security forces have stormed an apartment building in southern Russia, ending a two-day standoff and killing seven suspected Islamic extremists.

Thursday's assault in the capital of Russia's republic of Kabardino-Balkaria led to a gun battle lasting several hours. Smoke billowed from the upper floors, which were gutted by fire. At least two police officers were reported wounded.

Russian Forces Storm Apartment, Kill 7 Islamic Extremists

Russian authorities had surrounded the building Tuesday and opened negotiations with the suspects seeking their surrender

Russian Forces Storm Apartment, Kill 7 Islamic Extremists

Officials say the extremists belonged to the radical Islamic Yarmuk group, which they link to Chechen separatist fighters.

Russian Forces Storm Apartment, Kill 7 Islamic Extremists

The group was also blamed for an attack on a local drug enforcement office last month. Weapons were stolen and four agency employees were killed in that attack.

Kabardino-Balkaria is near the war-torn republic of Chechnya. Violence from years of conflict in that breakaway region has spilled into neighboring areas.