WASHINGTON (WUSA9) -- The Internal Revenue Service headquarters in downtown Washington will remain closed for the rest of the week after a fire Monday in the basement of the building.

According to an IRS statement, the fire affected the building's air handling system, which remains offline.

The IRS says employees that are able to telework are expected to do so. All other IRS offices in the D.C. area are not affected by the building closure.

Tax return process is not affected by the building closure and the IRS says people should continue to file their tax returns as normal.