https://abcnews.go.com/US/texas-elementary-school-reports-active-shooter-campus/story?id=84940951
...Sources said that the gunman first shot his grandmother at a separate scene. Authorities initially said the grandmother was killed but later said she was in critical condition...
...The suspect was immediately engaged outside the building as he approached the school by a Uvalde Independent School District police officer, who was shot by the suspect, the sources said.
After that, the suspect entered the school, barricaded himself in a classroom and allegedly opened fire, killing 18 students, who were mainly third- and fourth-graders, as well as one teacher, the sources said.
There, he traded gunfire with Uvalde ISD officer and Border Patrol Tactical Unit agents, a number of whom have children who attend the school, according to the sources. The Border Patrol agents responded to a law enforcement request for assistance.
Investigators are going through ballistics to determine who fired the shot that killed the suspect.
A fourth-grade student who was inside the school at the time described the horror of the shooting in an interview with ABC News. He said the students heard banging on a window and then the teacher saw the shooter.
"She said, 'Oh, my God, there's a there's a gun.' And then she she said it was like a big one like that a big gun -- she said, hurry up and get on the floor," the student recounted. "We just hear all kinds of gunshots going off, like nonstop, like constantly gunshots. And then we're over here all scared. What -- on the ground fearing for our lives..."