Another wave of school walkouts is expected as students honor victims of gun violence and push for gun control.
The latest protests are planned for Friday, the 19th anniversary of the Columbine High School shooting that left 13 people dead in Littleton, Colorado.
Organizers say more than 2,600 demonstrations are planned from Maine to Hawaii.
Many students say they'll wear orange and leave class at 10 a.m. to take a moment of silence for victims of Columbine and other shootings.
It follows a surge of youth activism following the Feb. 14 shooting at a high school in Parkland, Florida.
Students near Washington plan to rally for gun control at the Capitol. At Columbine High School, classes are canceled for a day of service.
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