(CNN) - FBI agents investigating the hacking of a personal email account belonging to Alaska governor Sarah Palin have searched the home of the son of a Democratic state legislator, federal law enforcement sources said Monday.
The search occurred late Saturday and early Sunday at the Knoxville home of David Kernell, 20, son of Memphis Democrat Mike Kernell.
Officially, Justice Department spokeswoman Laura Sweeney acknowledged Monday only that "investigative activity occurred" over the weekend. But three sources familiar with the case confirmed the search of Kernell's residence. No documents have been made public showing what equipment or evidence agents had seized.
The sources requested anonymity because the investigation is ongoing and no charges have yet been filed.
Although charges may be filed, none was believed to be imminent, according to the sources.
Palin's email account was hacked, and some of the contents were displayed briefly last week on an Internet website.
Although the displayed messages did not contain significant political disclosures, the McCain-Palin campaign issued a statement calling the incident "a shocking invasion of the governor's privacy and a violation of law."