The Branch Davidians were a religious sect that at the time was led by David Koresh. Believing Koresh had stockpiled illegal weapons, federal agents attempted to serve a search warrant on the complex on Feb. 28, 1993. An ensuing two-hour gun battle killed four agents and six in the compound. That began a 50-day standoff that ended with an attempted assault by the FBI and the deadly blaze. To this day, there is a dispute over whether the Davidians deliberately started the fire.