"Without fomal investigation into the claims, it is difficult to ascetain rumor from fact. Several claim the A_F had warned it employees to stay away from the building on April 19th. A_F maintains that five of its 15 agents assigned to the Murrah Bldg. were on the premises during the tragedy, and that five were injured, other reports (NYT and agent) suggests that no agents were on site at 9:02 am that morning. April 19th.
20 miles from the blast, UO ses recorded not one, but two explosive 'events' just after 9am on april 19th, within 10 seconds of each other. The Onmiplex Science Center in OKC recorded same dual disturbance, the second stronger than first. The second tick of the seismograph needle has been dismissed by skeptics as a mere echo of the main event."