This has a lot of new information:
"According to a federal law enforcement bulletin obtained by CBS News, the FBI found a note in Warner's house that led them to a witness. That witness told the FBI they spoke to Warner about a week before the bombing and that Warner gave the witness his car, saying he had cancer and did not need it anymore. Gloves and a beanie hat were found in that car, and DNA from those items was used to match Warner's DNA from the scene."
"The FBI has Warner's credit card information, and a preliminary examination appears to show purchases of chemical precursors and security alarms. "