Police evacuated workers from City Hall on Wednesday morning after officials received the third threat in three weeks about a supposed bomb there.
Police were notified at 9:42 a.m. that a threat had been received, they said.
Officers began searching the building at 222 W. Hargett St. after all employees and visitors were outside.
The two previous threats were on Mondays — May 14 and 21. No evidence of any explosives was found either time.
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There have also been bomb threats phoned to schools in Raleigh in recent weeks, also without any evidence of a bomb being found.
The building, also known as the city's municipal building, is on a parcel on the north side of West Hargett Street between South McDowell and South Dawson streets with the former Raleigh police headquarters and a parking deck.
Workers were let back into the building shortly after 11 a.m., and it was opened to the public a brief time later, police said.