The US State Department review of Hillary Rodham Clinton's e-mails so far has found as many as 305 messages that could contain classified information and require further scrutiny by federal agencies, the department said on Monday.

In a court filing that was part of a lawsuit against the State Department, officials told a federal judge in Washington they would be able to meet an existing schedule to release copies of Clinton's e-mails because only about 5 percent of the messages reviewed so far contain possible secret information.

The agency said those 305 e-mails were among more than 1,500 documents analyzed so far.