A new investigation claims the FBI's account of the 1995 Oklahoma City bombing is false, which is bad news for the government's credibility on its biggest domestic terror case.

• More than 100 people connected to the case were interviewed, and their accounts repeatedly clash with the official story that Timothy McVeigh acted alone.
• McVeigh's lead lawyer said McVeigh kept changing his story to match the government's version, and failed a lie detector test about whether he had help.
• A second suspect known as John Doe No. 2 appeared on wanted posters nationwide; officials publicly called it mistaken identity while privately telling agents to drop those leads and quietly kept hunting for him.
• Witnesses describe a second man renting the bomb truck, a stranger in the room near McVeigh's motel room days before the attack, and a truck at the alleged bomb-building site before McVeigh ever rented one.

Outlook: Expect renewed pressure for the FBI to explain the gaps, and fresh political fights over releasing the case files.