Two mass shootings in less than 24 hours left at least 29 dead and 53 injured, and the events shook a nation that seemed to have grown accustomed to the toll of gunfire in public places.

In El Paso, Texas, a lone gunman walked into a crowded Walmart Saturday morning, shooting with an AK-style semiautomatic rifle. Authorities were investigating the shooting, which killed 20 and injured 26 more, as a possible case of domestic terrorism and a hate crime because officials believe the suspect, a white man, was targeting Hispanics. He has been charged with capital murder.

Barely 13 hours later in Dayton, Ohio, in a downtown neighborhood crowded with bars and restaurants, a man wearing body armor and a mask opened fire with a .223-caliber semiautomatic rifle with a 100-round drum magazine. The suspect arrived at the scene with his sister, whom he killed in addition to eight others, Dayton Police Chief Richard Biehl said.

Read more: The Wall Street Journal