The evacuation has been lifted and workers have returned to the building.DURHAM, N.C. (WTVD) -- A bomb threat at Durham County Courthouse forced the building to be evacuated on Friday.[Ads /]At 9:24 a.m. 911 communications got the bomb threat call, according to Durham County Sheriff's Office.An explosives K9 searched the building and the evacuation was lifted and people are allowed to go back inside. Report a correction or typo