"The gunman was carrying a signed handwritten note in his duffel bag that said he wanted to "instill fear into their traitorous minds," said David Bowdich, special agent in charge of the Counterterrorism Division at the FBI's Los Angeles office. "His intent was very clear in his note," Bowdich told reporters Saturday. "In that note he indicated his anger and his malice toward the TSA officers."... He carried a Smith & Wesson .223-caliber M&P-15 assault rifle, five loaded magazines and a trove of ammunition, Bowdich said."