A clearer timeline is emerging of the mass shooting at an elementary school in Uvalde, Texas.
A gunman killed 19 children and two teachers at Robb Elementary School on Tuesday afternoon. Authorities say Salvador Ramos, 18, started the rampage by shooting his 66-year-old grandmother, Cecilia Martinez Gonzalez, in the face at her home in Uvalde before arriving at the school.
A motive in the attack remains unclear, officials said.