RICHMOND, Va. (AP) — A severed fiber optic cable shut down Virginia’s online voter registration system Tuesday, the last day to register before the November general election.

The Virginia Department of Elections said in statement on Twitter that a “fiber cut” was affecting connectivity for multiple agencies, including the citizen portal and registrar’s offices, and technicians were working to repair the problem. State officials didn’t say what caused the cut or when service was expected to be restored.

Andrea Gaines, a department spokeswoman, said in an email that the cut occurred in the Chester area near Route 10.

“Verizon technicians are on site and working to repair the cut; updates will be provided as work progresses,” she said.

The Washington Post reported that election officials in northern Virginia have been forced to register voters using paper forms.