Another issue is how the pallets were fused together. There were supposedly 19 (?) pallets; to detonate them at the same time they would need to be connected with either electrical detonator wiring or primacord, unless it was thought a single detonation would trigger the others. If the pallets were reloaded to another trailer after sitting in a warehouse someone would have to connect them. According to the above FSB report they were loaded by the warehouse lifts into the final trailer. Did the driver stop somewhere and string them together? Seems a bit of a skilled thing. And, of course, how were they triggered.