Survivors of a school shooting in Parkland, Florida, have taken to social media to express outrage and heartbreak after a new school shooting in Texas.
Authorities say a gunman opened fire at Santa Fe High School on Friday, killing 10 people.
"My heart is so heavy for the students of Santa Fe High School. It's an all too familiar feeling no one should have to experience.
"I am so sorry this epidemic touched your town - Parkland will stand with you now and forever," Marjory Stoneman Douglas student Jaclyn Corin said.
She also directed her frustration at US President Donald Trump, writing: "Our children are being MURDERED and you're treating this like a game. This is the 22nd school shooting just this year. DO SOMETHING."
Classmate David Hogg warned that politicians would soon descend on the Texas school acting as if they care but are only looking to boost approval ratings.
Cameron Kasky echoed those warnings: "Prepare to watch the NRA boast about getting higher donations. Prepare to see students rise up and be called 'civil terrorists' and crisis actors. Prepare for the right-wing media to attack the survivors."
Most of those killed on Friday when at least one gunman opened fire at a Houston-area high school were students, authorities said.
Harris County Sheriff Ed Gonzalez said he could not be precise about the number of deaths at Santa Fe High School, which went into lockdown at about 8am.
Monday marked the three-month anniversary since a former student allegedly opened fire on the Parkland, Florida, school in a Valentine's Day massacre that killed 17 people.
The shooting fuelled a massive student movement that led to gun reform legislation being passed in Florida and a national debate on stricter gun laws.
