Shortly after 2 p.m., yesterday, (Pearl Harbor day) Rigoberto Alpizar, 44, was seated near the rear of the plane among more than 110 other passengers aboard American Airlines flight 924, a Boeing 757, as it prepared to push back from the gate at Miami international. Jim Bauer, special agent in charge of the Miami office of the Federal Air Marshals yesterday told reporters agents aboard the aircraft then overheard Alpizar in his seat "uttering threatening words that included a sentence to the effect that he had a bomb." (As of midnight last night, neither Alpizar's exact words, nor any specific witnesses who heard them had been confirmed or identified.) Alpizar then became agitated, rose from his seat and fled the aircraft. Federal officials say Alpizar was pursued by the onboard Federal Air Marshals and was in the still-attached jetway when he failed to comply with verbal commands issued by the Air Marshals. The agents then opened fire. Alpizar was struck and killed. In the subsequent search, no explosives were found anywhere aboard the flight or among Alpizar's belongings. Authorities do not believe Alpizar was affiliated with any terrorist group. There were more than 110 passengers and crew within a stone's throw of the event. We have presented the very few accordant details supported by multiple sources at the time of this writing.