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In March, thousands of voters in Arizona reported waiting in hours-long lines to cast their vote in the state’s Democratic primary. Over 100,000 people have signed a petition demanding a revote in the state and now, the Civil Rights Division of the U.S. Department of Justice has officially opened an investigation to uncover what exactly happened during last month’s primary.

In a letter to the Maricopa County Recorder’s Office, the Justice Department said it was looking to find out if the county followed federal elections law during the March 22nd primary. Many voters reported still being in line as the media announced that former Secretary of State Hillary Clinton won the primary.

Those results were formally certified on Monday, the Associated Press reports, and according to the Arizona secretary of state, anyone wishing to challenge now has five days to file in court.

According to Buzzfeed, Maricopa County in Arizona is home to 1 million eligible voters for whom just 60 polling locations were available on the day of the primary. In 2012, there were 200 such locations.

County Recorder Helen Purcell told the Arizona Republic, “We made some horrendous mistakes, and I feel horrible about that.”