Photos: Tens of thousands rally against gun violence across US

People cross the Brooklyn Bridge as they attend "March for Our Lives" rally, one of a series of nationwide protests against gun violence, New York City, U.S.

A woman and a boy hold hands as they take part in a "March for our lives" rally for gun control in Parkland, Florida, U.S.

Demonstrators hold placards as they take part in the 'March for Our Lives', one of a series of nationwide protests against gun violence, in Washington, D.C., U.S.

People gather on the National Mall during 'March for Our Lives', one of a series of nationwide protests against gun violence, in Washington, D.C., U.S.

A boy holds a placard that reads "Guns don’t die, kids do" during a "March for our lives" rally for gun control in Parkland, Florida, U.S.

People participate in the March for Our Lives, one of a series of nationwide protests against gun violence, on the National Mall in Washington, DC, U.S.

Demonstrators hold placards as they take part in the 'March for Our Lives', one of a series of nationwide protests against gun violence, in Washington, D.C., U.S.

A boy holds a placard that reads "Not. One. More" during a "March for our lives" rally for gun control in Parkland, Florida, U.S.

Jazmin Cazares, 17, right, the sister of Jackie Cazares who was killed in Robb Elementary School shooting, gets a hug from Mary Morales of Kyle, Texas, during a "March for Our Lives" rally, one of a series of nationwide protests against gun violence, in Austin, Texas, U.S.

A sign lies on the grass as people gather on the National Mall during 'March for Our Lives', one of a series of nationwide protests against gun violence, in Washington, D.C.