The United States Capitol Police arrested 70 people at a protest taking place at Russell Senate Office Building on Thursday.

According to ABC News, the protesters were decrying alleged overcrowding conditions at U.S. Border Patrol facilities.

The protesters had poured into the Russell Senate Office Building on Capitol Hill and recited the names of migrant children who died in U.S. custody.

The protest started on the lawn of the U.S. Capitol before entering the Senate building, where protesters packed into the lobby.

All of those arrested—including a 90-year-old nun from Chicago—were charged with Crowding, Obstructing, or Incommoding.