WEST LAFAYETTE, Ind. (WLFI) — Employees at the Purdue Technology Center Aerospace building on Purdue University's campus have resumed operations after they were evacuated for a fire Wednesday afternoon. In total the building was closed for around two hours. Even though the building is open, a small section remains closed for cleanup.

The fire is believed to have started on the roof of the west side of the building, where Rolls-Royce operates. Purdue officials say contractors performing welding work on the roof caused the fire.

The smoke alarms went off in the building at 10:45 am. The building has around 200 employees. Purdue news officials say they doubt employees would need to be gone for the entire day.

The building is located in the 1800 block of Newman Road in West Lafayette, just off U.S. 231. The 55,000-square-foot facility was dedicated in March 2017.

CityBus was picking up people who needed to evacuate if they didn’t have a vehicle. The Hooks Building across the street had also opened its doors for employees.