Texas gunman Salvador Ramos warned an online pal in Germany he would "shoot up" an elementary school minutes before massacring 19 children and two teachers.
Ramos, 18, also sent a message saying he was going to shoot his grandmother and another one confirming he had done so, Governor Greg Abbott said at a news conference on Wednesday.
The police were called by the grandmother, whom he shot in the face, while Ramos fled the home they shared to carry out the atrocity.
