At least 4,000 people registered to vote on Saturday at "March for Our Lives" protests across the United States, Reuters reports.

According to Reuters, at least 4,000 people had registered to vote by 8:30 p.m., with the number of those who signed up growing as more cities concluded their sister marches and reported registration totals.

Survivors of the deadly shooting at Marjory Stoneman Douglas High School in Parkland, Fla., have made voter turnout a primary focus of their calls to action.

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"March for Our Lives" rallies across the country aimed to honor the memory of the 17 people who were killed in last month's shooting and show lawmakers the widespread support for gun control. Many speakers called on people to vote in their local and national elections to support candidates who will address gun violence.

A registration drive was held during the march. Organizers of the drive told Reuters they hoped to sign up at least 25,000 people on Saturday.

Sari Kaufman, a Marjory Stoneman Douglas student, urged fellow students and others to vote during a sister march in Parkland, Fla., on Saturday.

“With this movement, we will ensure record-breaking turnout not just in the next presidential election, not in the next midterm election, but in all elections,” Kaufman said, according to Reuters. “We’re here today to give you the tools to make a change."

The national rallies drew hundreds of thousands of demonstrators, with the Washington, D.C., march estimated to have drawn 800,000 people, according to organizers.