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Emergency crews gather in the parking lot of Santa Fe High School where at least ten people were killed on May 18, 2018 in Santa Fe, Texas. - At least ten people were killed when a student opened fire at his Texas high school on May 18, 2018, as President Donald Trump expressed "heartbreak" over the latest deadly school shooting in the United States. The shooting took place as classes were beginning for the day at Santa Fe High School in the city of the same name, located about 30 miles (50 kilometers) southeast of Houston."There are multiple fatalities," Harris County Sheriff Ed Gonzalez told reporters. "There could be anywhere between eight to 10, the majority being students." (Photo by Daniel KRAMER / AFP)        (Photo credit should read DANIEL KRAMER/AFP/Getty Images)
Emergency crews gather in the parking lot of Santa Fe High School where at least ten people were killed on May 18, 2018 in Santa Fe, Texas. - At least ten people were killed when a student opened fire at his Texas high school on May 18, 2018, as President Donald Trump expressed "heartbreak" over the latest deadly school shooting in the United States. The shooting took place as classes were beginning for the day at Santa Fe High School in the city of the same name, located about 30 miles (50 kilometers) southeast of Houston."There are multiple fatalities," Harris County Sheriff Ed Gonzalez told reporters. "There could be anywhere between eight to 10, the majority being students." (Photo by Daniel KRAMER / AFP)        (Photo credit should read DANIEL KRAMER/AFP/Getty Images)

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    Evening news briefing from CNN

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Evening news briefing from CNN

Evening news briefing from CNN on Friday, May 18.

Evening news briefing from CNN

Evening news briefing from CNN on Friday, May 18.