US Justice Department will conduct a "Critical Incident Review" of law enforcement's response to the shooting amid criticism over why police failed to swiftly confront the gunman.
Videos surface of desperate parents begging police to storm Robb Elementary School, where a teenage gunman killed 19 small children and two teachers two days ago before being shot dead by officers "approximately an hour" later.
Gunman kills at least 19 children and two teachers at an elementary school in south-central Texas state before being shot dead by responding police, officials say.
Fifteen-year-old Ethan Crumbley, who was charged with murder and terrorism for a shooting that left four of his classmates dead, recorded a video night before the violence, officials say.
Fifteen-year-old student opens fire at a high school in Michigan state, killing three students and leaving eight other people including a teacher wounded, police say.
Instead of cracking down on gun control, US President Donald Trump appears to be considering a policy of arming teachers. He says shooters see gun-free zones and think "let's attack."
Sheriff Scott Israel says as 19-year-old shooter Nikolas Cruz moved through the school, he fired into five classrooms , four on the first floor and one on the second floor.
The 14-year-old gunman, who injured three people at a South Carolina elementary school before being arrested, carried out the attack after killing his father.
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