RICHMOND, Va. (AP) — An accidentally severed fiber optic cable shut down Virginia's online voter registration system for several hours Tuesday, the last day to register before the November general election, authorities said.

The Virginia Department of Elections said in statement on Twitter that a “fiber cut” affected connectivity for multiple agencies, including the department's citizen portal and registrar's offices. The cable was inadvertently cut during a Chesterfield County roadside utilities project, according to the state’s information technology agency.

Six hours later, the Department of Elections issued a statement saying the portal was back online. But the fallout already included threats of legal action and concern that voters were being disenfranchised at a crucial moment.

Voting advocates said the accident couldn't have come at a worse time and lambasted state officials for the technological failure. The day of the deadline is when many Virginians decide to register, particularly after being reminded on social media and in the news.

The Lawyers’ Committee for Civil Rights Under Law and the Advancement Project are planning to file a lawsuit arguing that the state's voter registration deadline should be extended for 48 hours, according to committee spokesman Ian Weiner. And Democratic members of Virginia's congressional delegation had called for a 72-hour extension.

U.S. Reps. Don Beyer, Gerry Connolly and Jennifer Wexton said in a statement that they “hope the courts will swiftly grant such an extension” and account for the time it will take to inform the public of a new deadline.

Virginia Gov. Ralph Northam said at a press conference that he supports extending the deadline. But he said it appears that only the courts have the ability to change it.

Northam, a Democrat, said the state did not have a backup plan for this particular cable and the episode shows the need for the state to continue its efforts at creating a secure network.

“Obviously, we still have a lot of work to do," Northam said.

Secretary of Administration Keyanna Conner said the cut occurred on a 10-gigabit optical fiber circuit that was installed this spring to help the state handle increased web demand during the coronavirus. She said backup circuits aren't as large as the main circuit, but plans are in place to upgrade them.

Virginia, which has 13 electoral votes, is not considered a marquee battleground state in the presidential race by political observers. But three congressional races are considered highly competitive, and their outcomes could affect the makeup of the U.S. House.

Democratic freshmen Reps. Abigail Spanberger and Elaine Luria are facing tough challenges in the 7th District and 2nd District, respectively, and the 5th District seat is open. The races in the 2nd and 5th districts are considered a “toss up” by the Cook Political Report. Spanberger's seat is listed as leaning Democratic.

While the site was down, people who wanted to register could still fill out applications in person. They could also mail paper copies, as long as they are postmarked Tuesday, said Vicki Lewis, the voter registrar for the city of Newport News. People who wanted to vote early were given provisional ballots, which will be counted the day after this year’s Nov. 3 election.

This isn't the first time technical problems affected Virginians' ability to register to vote under a looming deadline.

In 2016, an unknown number of people were not able to register because of unprecedented demand, in part because of social media postings reminding people of the registration deadline that year.

A voter advocacy group, the New Virginia Majority Education Fund, sued for an extension and a federal judge granted a brief one to make up for the computer glitches that occurred.

The Lawyers’ Committee for Civil Rights Under Law, which filed the 2016 lawsuit on the voter group’s behalf, swiftly condemned state officials for the disruption Tuesday.

Kristen Clarke, executive director of the committee, said Virginia election officials “have again failed the public.”

“This error is particularly astounding given that this same problem occurred at virtually the same time in 2016,” she said. "It is astonishing that Virginia has not learned from failures of the not-so-distant past.”

Clarke said the group anticipates pursuing legal action to get an extension to give voters additional time. In 2016, more than 25,000 people registered to vote after the judge's 36-hour extension, she said.

“This is a big deal,” Clarke said of the severed cable. “People often are getting the notices about how to register close to the deadline. And the days leading up to a deadline are often when many people are seeking to avail themselves of the right to register."

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Finley reported from Norfolk.

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This story has been corrected to show it was a 10-gigabit cable, not 10-gigabyte.