School security expert says shooters often come prepared to kill many people

School security expert John Matthews provides his analysis of the mass shooting at a Texas elementary school.

At least 20 people, including 18 children, were killed in a shooting at Robb Elementary in Uvalde, according to law enforcement officials. Several others, both students and adults, are being treated for injuries.

The alleged shooter was also killed, local police confirmed. It is believed that shooter acted alone. He has been identified as 18-year-old Salvador Ramos. Department of Public Safety officials have told KENS 5 that there are two adult fatalities, a teacher and the gunman. However, Sen. Roland Gutierrez told the Associated Press there are a total of three adult fatalities.

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