Air tests are tonight being carried out at a Government Department office in Letterkenny following the discovery of asbestos.
The substance was found during renovation work at the Social Welfare Offices and has been removed.
The offices were closed today after staff expressed fears overt the find.
The Department has confirmed that some low risk asbestos was found at the offices on the High Road.
A further clean-up of the building was arranged for today but no further asbestos was found.
Approximately 30 people work in the offices.