Lawyer Wade Smith said he has learned from other attorneys and other sources that several new subpoenas were issued. Smith said Edwards didn't violate any law.
"We want them to look as carefully as they wish," said Smith, who declined to discuss who got subpoenas or when the grand jury would call them as witnesses.
The subpoenas indicate signs of life for an investigation that hasn't publicly shown activity for a year. Edwards mistress Rielle Hunter and former aide Andrew Young made appearances at the federal courthouse in Raleigh a year ago to testify before a grand jury.
Young says he testified about vast sums of money that changed hands to help keep Hunter in hiding.
Edwards, a former North Carolina senator and 2004 Democratic candidate for vice president, has largely been in seclusion since admitting two years ago that he had an affair with Hunter. He publicly admitted for the first time earlier this year he fathered her child. John and Elizabeth Edwards have separated after more than 30 years of marriage.
Hunter worked for Edwards' political action committee in 2006, shooting behind-the-scenes video as the Democrat prepared to launch his second White House campaign. The committee paid her video production firm $100,000 that year and then another $14,000 later on in what a senior campaign official described as a payment for leftover footage.
Young, who has written a tell-all book about the Edwards campaign, has told CBS affiliate WRAL that more than $1 million was spent to conceal the candidate's affair with Hunter.
He has said he was tasked with taking care of Hunter both during the campaign and after, and during the 2008 campaign he claimed to be the father of Hunter's child with Edwards.
Young described receiving hundreds of thousands of dollars in support from Edwards supporter Bunny Mellon, the wealthy widow of banking heir Paul Mellon, and from Edwards campaign finance leader Fred Baron, who died last year.
Young said Wednesday he has not received another subpoena.