A student holds up her hands while taking part in National School Walkout Day to protest school violence Friday, April 20, in Chicago. Students from around the nation joined in the walkout against gun violence on the 19th anniversary of the shooting at Columbine High School.
A student holds up her hands while taking part in National School Walkout Day to protest school violence Friday, April 20, in Chicago. Students from around the nation joined in the walkout against gun violence on the 19th anniversary of the shooting at Columbine High School.
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Students embrace as others raise their fists in a moment of silence for victims in Los Angeles.
Students embrace as others raise their fists in a moment of silence for victims in Los Angeles.
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Hundreds of students gather on the steps at the State Capitol in St. Paul, Minnesota.
Hundreds of students gather on the steps at the State Capitol in St. Paul, Minnesota.
Jim Mone/AP
Eugena King, senior class president at Herron High School, speaks out to fellow students at the Soldiers and Sailors Monument in Indianapolis.
Eugena King, senior class president at Herron High School, speaks out to fellow students at the Soldiers and Sailors Monument in Indianapolis.
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Students gather at the Iowa State Capitol in Des Moines.
Students gather at the Iowa State Capitol in Des Moines.
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Students at Naples High School, in an effort to revive action on gun reform, walk out of school in Naples, Florida.
Students at Naples High School, in an effort to revive action on gun reform, walk out of school in Naples, Florida.
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Several hundred high school students march from the White House to the US Capitol to rally against the National Rifle Association (NRA) and call for stricter gun laws in Washington.
Several hundred high school students march from the White House to the US Capitol to rally against the National Rifle Association (NRA) and call for stricter gun laws in Washington.
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Several hundred high school students from the Washington area observe 19 minutes of silence while rallying in front of the White House before marching to the US Capitol.
Several hundred high school students from the Washington area observe 19 minutes of silence while rallying in front of the White House before marching to the US Capitol.
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Ryan Deitsch, right, a high school senior, carries a sign that reads "love" as he joins his fellow students from Marjory Stoneman Douglas High School, where 17 classmates and teachers were killed during a mass shooting in February, for the National School Walkout in Parkland, Florida.
Ryan Deitsch, right, a high school senior, carries a sign that reads "love" as he joins his fellow students from Marjory Stoneman Douglas High School, where 17 classmates and teachers were killed during a mass shooting in February, for the National School Walkout in Parkland, Florida.
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Students at Clayton-Bradley STEM Academy in Maryville, Tennessee, set up chairs representing every US school shooting since 2000.
Students at Clayton-Bradley STEM Academy in Maryville, Tennessee, set up chairs representing every US school shooting since 2000.
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Student activists participate in a "die-in" to protest gun violence at Washington Square Park in New York.
Student activists participate in a "die-in" to protest gun violence at Washington Square Park in New York.
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Students from the Nashville, Tennessee, area gather at Public Square Park to call for gun law reform.
Students from the Nashville, Tennessee, area gather at Public Square Park to call for gun law reform.
Shelley Mays/The Tennessean/USA TODAY NETWORKSipa USA
Student activists rally against gun violence at Washington Square Park in New York.
Student activists rally against gun violence at Washington Square Park in New York.
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