Fire and smoke in the Russell Senate Office Building prompted an evacuation Saturday night. The building remains closed Sunday morning.

Capitol Police and the Architect of the Capitol personnel are conducting an investigation and all other personnel will be restricted from entering the building.

Smoke was reported in a number of locations in Russell just after 6 p.m. Saturday night and D.C. Fire and EMS were called to investigate. The smoke was light, according to D.C. Fire, but it signaled that something was wrong in the building.

D.C. Fire personnel found electrical motors in the Russell attic that had burned up and activated the sprinkler system, according to Vito Maggiolo, Public Information Officer for D.C. Fire. He said the sprinkler system had already extinguished the small fire, which was completely confined to the attic area of the building.

DC Fire personnel worked with Capitol Police to ventilate smoke from the building before leaving the scene around 10 p.m. The evacuation of the Russell Buildingby Capitol Police was completed by about 10:30 p.m. Saturday, but the building remains closed.