Estimates by researchers Erica Chenoweth and Jeremy Pressman show that about 1.2 million Americans from coast to coast marched over the weekend in protest of gun violence, spurred by the recent school shooting at Marjory Stoneman Douglas High School last month in Florida.
The count is still preliminary: The researchers estimate that there were more than 450 marches in the US over the weekend but only have crowd estimates for about half of them.
There’s also a lot of uncertainty with individual marches. The biggest march — in Washington, DC — drew anywhere from 200,000 to 800,000 people, depending on whether you believe the low-end number put out by the private firm Digital Design & Imaging Service or the high-end number from march organizers.
According to the Associated Press, the March for Our Lives in D.C. constitutes one of the biggest youth marches since the Vietnam War.
The grand total could go up as smaller marches all across the U.S. send their numbers to be counted.