Claim: The Austin serial bombings were difficult to stop as the perpetrator used many different triggers for the bombs such as being picked up or using a tripwire, a wire or cord is attached to some device for detecting or reacting to physical movement.
Evidence: Two of the first three bombs were triggered upon being picked up, and another triggered upon being opened. The fourth bomb was activated by tripwire. Typically, a wire or cord is attached to some device for detecting or reacting to physical movement.