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Santa Fe High School

Survivors of the school shooting in Parkland, Florida, took to social media to express outrage and heartbreak in the aftermath of the Friday school shooting in Texas, where authorities say a gunman opened fire, killing 10 people.

Updated at 10:45 p.m. ET

At least 10 people were killed when a gunman opened fire inside a small-town Texas high school, in what Gov. Greg Abbott called "probably the worst disaster ever to strike this community."

Ten others were wounded in the morning attack at Santa Fe High School.