Three people were killed Monday in a crash at a construction site near a business district in Charlotte, North Carolina, authorities said.

Charlotte Fire Department Captain Jackie Gilmore told reporters at the scene that scaffolding had collapsed at the construction site shortly after 9 a.m. Two other construction workers were taken to a hospital for evaluation.

All work at the construction site was halted until investigators from the Occupational Safety and Health Administration could assess.

Construction workers fell approximately 70 feet, according to WCNC, NBC affiliate.

Charlotte’s Queen City News reported that the construction site where the accident occurred is being developed as a luxury senior community, but the Houston-based developer behind the project, Bridgewood Property Company, said the accident occurred at an address neighbor.