After surounding the building the police cut off the buildings water supply and electricity, forcing them to use oil lamps and candles without a working sprinkler system. Here is what the media won't tell you, the gas used was no regular tear gas that could have been substituted by accident, instead it is an internationally banned substance! That means that even the police do not have access. In fact, it would be illegal for the BATF, the FBI or anyone else to use this gas without a signature from the White house. The reason the U.N. banned use of the gas is because it is potentially flammable. Here's the really jouicy part; Heat is not enough to ignite it, sure it would require an open flame but it also requires a strong draft. The open flame was provided by the lamps and candles but they had to create the draft. Shooting out all the windows was not enough, the problem is that there were no windows on the side of the building. When the gas didn't ignite a tank was ordered to poke several holes in the side of the building.(after the press was ordered to leave) One reporter with a high powered zoom lens captured a shot that was played live on television. The video clip showed how the fire started, as the tank was punching holes in the wall fire shot out through on of the holes. This very improtant video was shown repeatedly for about an hour before being taken off the air and to my knowledge never shown again.
Other facts of note:
The first shots were fired using a sniper rifle from a trailer behide the rest of the police. This was done in order to get the Branch Dividions to shoot back. Some of the police reported seeing the rifle flare from a trailer at the same moment the first shots were fired.
Also the cop who was shot while clibing on the roof toward a window was hit by friendly fire. Maybe from that trailer agian, to escalate the situation.
You should read the book "Stealing the Minds of Americans", a real eye opener.