Federal authorities say they have video and audiotapes of an Ohio man meeting with a confidential informant in a plot to attack the U.S. Capitol.

Prosecutor Timothy Mangan disclosed the planned evidence during a pretrial meeting in Cincinnati. U.S. District Judge Sandra Beckwith met with attorneys to discuss handling classified information in the case of 20-year-old Christopher Lee Cornell.

A transcript from the in-chambers conference Tuesday shows that Mangan said meetings between Cornell and the informant over a six-day period were recorded. He says authorities are working to shield the informant's identity in tapes.

Cornell has pleaded not guilty to the attempted murder of U.S. officials and employees and two other counts. His father has said Cornell was coerced by a "snitch" trying to improve his own legal situation.