A teacher killed in the Texas school shooting desperately phoned her police officer husband for help but he was prevented from going into the building by colleagues.
Police chiefs have been criticised over why they took so long to kill gunman Salvador Ramos at Robb Elementary School, with officers trained to confront an active shooter rather than hold back.
Yet the gunman entered the school at 11.33am last Tuesday and he was not killed until 12.51pm, according to a timeline from the head of state police Steven McCraw.
