The Coroner, Robert Chapman, heard accounts from passengers on the minibus who described a scene of carnage.
Lynne Davidson, who escaped with minor injuries, described what happened when she found Miss Rennie:
"I became aware of Rebecca lying on the floor, I asked her how she was, someone put a blanket over her, she wasn't' making any noise"
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The "terrified" victim was forced to hand over her bag and phone, as the men held a knife to her face.
Anthony Davidson had the blade of a Stanley knife in his pocket, when he was arrested in grounds of the nursery and infant school.
The news could have major implications for the Moorside development in Cumbria.