Passage: In early 1974, Byck made his decision to assassinate Nixon. He planned to do so by hijacking an airliner and crashing it into the White House on a day when Nixon would be there. It has been suggested (for instance, by the 2004 film dramatization of his life) that Byck was inspired by news reports of the buzzing of the White House by U.S. Army soldier Robert K. Preston in a stolen UH-1B Huey helicopter on February 17.Since Byck was already known to the Secret Service and because legal attempts to purchase a firearm might have resulted in increased scrutiny, Byck stole a .22 caliber revolver from his friend to use in the hijacking. Byck also made a bomb out of two gallon jugs of gasoline and an igniter. All through this process, Byck made audio recordings explaining his motives and his plans; he expected to be considered a hero for his actions and wanted to fully document his reasons for the assassination.On Friday morning, February 22, Byck drove to the Baltimore/Washington International Airport. Shortly after 7:00 a.m. EST, he shot and killed Maryland Aviation Administration policeman George Neal Ramsburg before storming a DC-9, Delta Air Lines Flight 523 to Atlanta, which he chose because it was the closest flight that was ready to take off. After pilots Reese (Doug) Loftin and Fred Jones told him they could not take off until wheel blocks were removed, he shot them both and grabbed a nearby passenger, ordering her to "fly the plane". Jones died as he was being removed from the aircraft after the event was concluded; Loftin survived the attack. Byck told a flight attendant to close the door, or he would blow up the plane. Anne Arundel County policemen attempted to shoot out the tires of the aircraft to prevent it from taking off; but the .38 caliber bullets fired from the Smith & Wesson revolvers issued to policemen at that time period failed to penetrate the tires of the aircraft and ricocheted off, some hitting the wing of the aircraft.After a standoff between Byck and police on the jetway, county...

Question: What was the gas bomb located in?
briefcase