Editing The Oklahoma City Bombing (section)

==The bombing==
McVeigh entered Oklahoma City at 8:50 a.m. At 8:57 a.m., the Regency Towers Apartments' lobby security camera that had recorded Nichols's pickup truck three days earlier recorded the Ryder truck heading towards the Murrah Federal Building. At the same moment, McVeigh lit the five-minute fuse. Three minutes later, still a block away, he lit the two-minute fuse. He parked the Ryder truck in a drop-off zone situated under the building's day-care center, exited and locked the truck. As he headed to his getaway vehicle, he dropped the keys to the truck a few blocks away.

At 9:02 a.m. (14:02 UTC), the Ryder truck, containing over 4,800 pounds (2,200 kg) of ammonium nitrate fertilizer, nitromethane, and diesel fuel mixture, detonated in front of the north side of the nine-story Alfred P. Murrah Federal Building. 168 people were killed and hundreds more injured. One third of the building was destroyed by the explosion, which created a 30-foot-wide (9.1 m), 8-foot-deep (2.4 m) crater on NW 5th Street next to the building. The blast destroyed or damaged 324 buildings within a 4-block radius, and shattered glass in 258 nearby buildings. The broken glass alone accounted for 5 percent of the death total and 69 percent of the injuries outside the Murrah Federal Building. The blast destroyed or burned 86 cars around the site. The destruction of the buildings left several hundred people homeless and shut down a number of offices in downtown Oklahoma City. The explosion was estimated to have caused at least $652 million worth of damage.

The effects of the blast were equivalent to over 5,000 pounds (2,300 kg) of TNT, and could be heard and felt up to 55 miles (89 km) away. Seismometers at the Omniplex Science Museum in Oklahoma City, 4.3 miles (6.9 km) away, and in Norman, Oklahoma, 16.1 miles (25.9 km) away, recorded the blast as measuring approximately 3.0 on the Richter magnitude scale.

The collapse of the northern half of the building took roughly 7 seconds. As the truck exploded, it first destroyed the column next to it, designated as G20, and shattered the entire glass facade of the building. The shockwave of the explosion forced the lower floors upwards, before the fourth and fifth floors collapsed onto the third floor, which housed a transfer beam that ran the length of the building and was being supported by four pillars below and was supporting the pillars that hold the upper floors. The added weight meant that the third floor gave way along with the transfer beam, which in turn caused the collapse of the building.