Gun control group Moms Demand Action reportedly marched through Washington, D.C. late Saturday night to both the White House and the U.S. Capitol, partly in response to Saturday’s mass shooting in El Paso, Texas.

The Washington Post reports the gun control group was already in Washington over the weekend for an annual conference and that some members were planning to go to the White House, but the El Paso shooting that claimed 20 lives spurred more people to join.

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“The tenor and tone of the whole room changed,” Amber Gustafson, one of the group’s leaders said, according to the Post, referring to the reaction after hearing about the shooting.

“We’re fed up,” she added. “It’s past time for change.”

A spokesperson for the gun control group told the newspaper that hundreds of members were in attendance at one point in the demonstration.

Washington, D.C., Mayor Muriel Bowser (D) posted a video of the protest on Twitter Saturday.

Moms Demand Action, a national group made up of both men and women, was formed in response to the Sandy Hook, Conn. shooting to call for gun control legislation on both a state and federal level.

The shooting in El Paso took place at a crowded Walmart Saturday and was committed by a 21-year-old white male who authored a racist and anti-immigrant manifesto that appeared on the online forum 8chan before the attack.

The gun control group marched in Washington just hours before a second mass shooting over the weekend, this time in Dayton, Ohio, claimed another nine lives. The shooter, who has yet to be identified, was killed by police.