The ATF had planned a sudden daylight raid of the ranch in order to serve these warrants. Any advantage of surprise was lost when a local reporter who had been tipped off about the raid asked for directions from a U.S. Postal Service mail carrier who was coincidentally Koresh's brother-in-law. Thus, the group's members were fully armed and prepared; upon the ATF initiating the raid, an intense gunfight erupted, resulting in the deaths of four ATF agents and six Branch Davidians. Following the ATF entering the property and its failure to execute the search warrant, a siege was initiated by the Federal Bureau of Investigation (FBI), during which negotiations between the parties attempted to reach a compromise.
After 51 days, on April 19, 1993, the FBI launched a tear gas attack in an attempt to force the Branch Davidians out of the compound's buildings. Shortly thereafter, the Mount Carmel Center became engulfed in flames. The fire and the reaction to the final attack within the group resulted in the deaths of 76 Branch Davidians, including 20–28 children and David Koresh.[15][16]
The events of the siege and attack, particularly the origin of the fire, are disputed by various sources. Department of Justice reports from October 1993 and July 2000 conclude that although incendiary tear gas canisters were used by the FBI, the Branch Davidians had started the fire, citing evidence from audio surveillance recordings of very specific discussions between Koresh and others about pouring more fuel on piles of hay as the fires started, and from aerial footage showing at least three simultaneous ignition points at different locations in the building complex.[17][18][19] The FBI contends that none of their agents fired any live rounds on the day of the fire.[18] Critics contend that live rounds were indeed fired by law enforcement, and suggest that a combination of gunshots and flammable tear gas was the true cause of the fire.[20][21][22]
^River, Charles (2018). The Special Air Service: The History of the Secret British Special Forces Unit from World War II to Today. Charles River Editors. p. 60.
^"Survivors of 1993 Waco siege describe what happened in fire that ended the 51-day standoff". ABC News. January 3, 2018. Archived from the original on May 23, 2022. Retrieved April 1, 2022. The article publicized an ABC documentary "Truth and Lies: Waco" broadcast on January 4. The article states "about 80 people, including more than 20 children, died in the fire. Only nine people survived." It also states that there were 46 children inside the compound at the start of the siege, 21 of whom were released during the first five days of negotiations.
^"25 Years After The Tanks, Tear Gas And Flames, 'Waco' Returns To TV". National Public Radio. January 23, 2018. Archived from the original on January 28, 2022. Retrieved September 8, 2022. The article features an interview with FBI negotiator Gary Noesner. The article states "35 people out through the negotiation process, including 21 children."
^Justin Sturken; Mary Dore (February 28, 2007). "Remembering the Waco Siege". ABC News. Archived from the original on August 3, 2008. Retrieved June 23, 2008.
^Smyrl, Vivian Elizabeth (June 12, 2010). "Elk, Texas". Handbook of Texas – Texas State Historical Association. Archived from the original on June 5, 2013. Retrieved November 25, 2012.
^Ames, Eric S (2009). Images of America WACO. Arcadia Publishing. ISBN978-0-7385-7131-7.