The Rayburn House Office Building was evacuated Thursday morning because concrete dust entered the building from the rehabilitation project in the garage, an Architect of the Capitol spokeswoman said.

The building was evaluated and reopened. Lobby 8, on the ground floor, took longer to clean up but was reopened by 3 p.m.

House staffers received an e-mail alert at 7:31 a.m. that Capitol Police were investigating an “industrial incident” in Rayburn and that the building and garage were closed. There were also barricades at Washington Avenue and C Street Southwest.

[Burst Pipe Causes Flooding in Rayburn]

Just before 9 a.m., staffers received another alert that the investigation was concluded.