The leader, Abdul Abdullah Yahia, already a notorious murderer, and the other three members of the Armed Islamic Group (Groupe Islamique Armé, or GIA) brandished firearms and explosives and announced their allegiance to the GIA, demanding co-operation from the 220 passengers and 12 flight crew. The hijackers had Kalashnikov assault rifles, Uzi submachine guns, pistols, homemade hand grenades and two 10-stick dynamite packs. Later, at one point during the flight, the men placed one pack of dynamite in the cockpit and one pack under a seat in the middle of the aircraft, then linked them with detonator wire. They also took the uniforms of the pilots to confuse Algerian army snipers.