[citation needed] It came within days of the Washington, D.C. hearings on the death of 34 people in a National Airlines plane crash near Bolivia, North Carolina (later discovered to have been the result of a bomb)."[2] The Associated Press reported that at 5:44 p.m., 90 minutes after news of the crash, an anonymous caller had informed Chicago police that a bomb had been placed on board a plane at Midway Airport.FBI agents were dispatched to the scene to determine whether any violation of federal law had occurred, such as sabotage, and to assist with fingerprint identification of victims.The plane's last radio transmission occurred when it was over Scotland, Indiana, about 70 miles (110 km) from the crash site, but the pilot reported no trouble and the skies were clear.State police faced great difficulty reaching the main crash site because of the area's thickly wooded, steep hills and a scarcity of roads in the vicinity.