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Students walk towards the Capitol April 20, 2018. Photo: Tom Williams/CQ Roll Call

Nineteen years ago today, at 11:19 am, high school students Dylan Klebold and Eric Harris walked into Columbine High School in Colorado and opened fire. They killed 12 students and a teacher, injured 23 others, and killed themselves in the library just after noon. Five hours passed before the situation was under control.

Fast forward: Starting at 10am today, students across the nation, including those from Marjory Stoneman Douglas High School, have been staging more than 2,600 walkouts to honor the 19th anniversary of the massacre and demand action from lawmakers on gun legislation, according to the National School Walkout organizer’s web site.

Columbine High School is closed today, a commemorative practice it has held annually since the shooting, along with a day of service. Some Columbine students held a vigil and a voter registration rally Thursday evening, which included students from Parkland, Florida, per the AP.

Situational awareness: Today, a student was shot at a high school in Ocala, Florida. A suspect is in police custody.

What we're seeing around the country:

Students in Chicago joined in the walkout against gun violence on the 19th anniversary of the shooting at Columbine High School. Photo: Jim Young/Getty Images
Palo Verde High School student Mallory McKissick participates in the National School Walkout in Las Vegas. Photo: Ethan Miller/Getty Images
Amit Dadon, a 2017 graduated from Marjory Stoneman Douglas High School, participating in the April 20th protests in D.C. Photo: Andrew Caballero-Reynolds/AFP/Getty Images
Students take part in a rally for National School Walkout Day to protest school violence. Photo: Jim Young/Getty Images
Students from Washington-Lee High School join the National School Walkout in Arlington, Virginia. Photo: Win McNamee/Getty Images

Go deeper

The week the Trump show ended

Data: NewsWhip; Chart: Andrew Witherspoon/Axios

Donald Trump was eclipsed in media attention last week by President Biden for the first time since Trump took office, according to viewership data on the internet, on social media and on cable news.

Why it matters: After Trump crowded out nearly every other news figure and topic for five years, momentum of the new administration took hold last week and the former president retreated, partly by choice and partly by being forced off the big platforms.

Pay TV's bleak post-pandemic outlook

Data: eMarketer; Chart: Axios Visuals

The pandemic has taken a huge toll on the Pay-TV industry, and with the near-term future of live sports in question, there are no signs of it getting better in 2021.

Why it matters: The fraught Pay-TV landscape is forcing some smaller, niche cable channels out of business altogether.

2 hours ago - World

Biden sets his sights on China

Photo illustration: Eniola Odetunde/Axios. Photo: Frederic J. Brown/Getty Images  

The new administration's first few moves and statements on China suggest that President Biden may continue some of the Trump era's most assertive policies.

Why it matters: China's severe domestic repression, its dramatic rise as a technological superpower, and its increasingly aggressive actions around the globe mean that the world expects the American president to take action.