NASHVILLE, Tenn. (WKRN) – The Tennessee State Capitol was evacuated for about an hour late Monday afternoon when a fire broke out as constructions crews worked in an underground tunnel.

Fire officials said some insulation caught fire as they were working on an elevator shaft, but it was extinguished by the crews by 4:40 p.m.

The building was evacuated due to concerns over the smoke, but everyone was let back inside about 5:20 p.m. No injuries were reported.

Authorities went to Fifth Avenue by Municipal Auditorium to help let some of the smoke out. While the smell of smoke lingered, none was visible once the capitol was reopened.

The underground tunnel from Capitol Hill to the nearby Cordell Hull State Office Building has been under construction for some time. The goal is to make it easier for lawmakers to get from one place to the next.

Further details weren’t immediately released.