Georgia Secretary of State Brian Kemp (R) said Tuesday his office was investigating allegations of voter fraud by a group led by the state’s Democratic House minority leader that it believes may have forged voter registration documents and signatures and filled out voter applications with false information.

Kemp said in a memo obtained by WSBTV that his office has received complaints about the group in five counties in northern Georgia outside Atlanta — Barow, Butts, DeKalb, Gwinnett, Henry, and Muscogee — and sent subpoenas to the New Georgia Project and Third Sector Development, its parent organization, led by Georgia Rep. Stacey Abrams (D).

Abrams told the Washington Post the group was surprised by the subpoena because they reached out to the secretary of state’s office proactively in June to ensure they complied with state law.

“It is a non-partisan project,” Abrams said. She said the group hired hundreds of canvassers who were trained and went through background checks.

Of the more than 85,000 registration forms the group has turned in so far, about 11 percent were incomplete, Abrams said, but state law requires they turn in all forms they receive, regardless of whether or not they are complete. “We don’t get to decide if something is good or bad,” she said. Those incomplete forms were flagged, however, by the group before being turned in.

“We’re just not going to put up with fraud,” Kemp told WSBTV. “I mean, we have zero tolerance for that in Georgia, so we’ve opened an investigation and served some subpoenas.”