The Arlington County Police Department on Thursday launched a criminal investigation into charges of election fraud against the son of Rep. Jim Moran, D-Va., following the release of a hidden-camera video in which voting abuses are discussed.

The video shows Patrick Moran being approached by a man who says he's looking to cast votes for 100 registered Virginia voters who are unlikely to vote themselves, but that he isn't sure how to do so. After a lengthy discussion, Moran appears to suggest that the man should forge utility bills to use as a form of voter ID at the polls.

Just hours after the video was released, Moran, who had been serving as the field director for his father's re-election campaign, resigned from his post.

After officers were made aware of the video, Arlington County Police spokesman Dustin Sternbeck said that they and the county's Commonwealth Attorney's Office initiated the criminal investigation.

"In light of the video, it would've been irresponsible of us to not act on it," Sternbeck said.

Jim Moran issued a statement saying the incident was "teaching Patrick a tough lesson early in life" and that he accepted his son's resignation.

"I know that my son's intention was to deflect the line of questioning by this trained political operative bent on goading him into a specific response," Moran said in a statement. "But the fact remains that the conversation drifted into discussions that reflected a serious error in judgment that Patrick wishes he could take back."

Jim Moran has represented Virginia's 8th Congressional District, which includes portions of the District, Arlington and Fairfax counties and the cities of Alexandria and Falls Church, since 1990.

"We're going to start with the individuals who produced the video," Sternbeck said of the investigation. "But all parties will be investigated."

Charles Hokanson, the chairman of the Arlington County Republican Committee, called for Moran's resignation following the county's announcement of its investigation.

"The people of Arlington -- Republicans, Democrats and independents -- will not tolerate potential voter fraud, and we demand of all our officials that they preserve the full integrity of our voting process," Hokanson said. "It's time for Jim Moran to go, [whether] by resignation in disgrace, or by voter indignation at the voting booth on Nov. 6."