Branch Davidians
On April 19, 1993, the FBI moved for a final siege of the compound using large weaponry such as .50 caliber (12.7 mm) rifles and armored Combat Engineering Vehicles (CEV) to combat the heavily armed Branch Davidians. The FBI attempted to use tear gas to flush out the Branch Davidians. Officially, FBI agents were only permitted to return any incoming fire, not to actively assault the Branch Davidians. When several Branch Davidians opened fire, the FBI's response was to increase the amount of gas being used. Around noon, three fires broke out simultaneously in different parts of the building. The government maintains that the fires were deliberately started by Branch Davidians. Some Branch Davidian survivors maintain that the fires were started either accidentally or deliberately by the assault. Of the 85 Branch Davidians in the compound when the final siege began, 76 died on April 19 in various ways, from falling rubble to suffocating effects of the fire, or by gunshot from fellow Branch Davidians. The siege lasted 51 days.