1. Two mass shootings in less than 24 hours.

A gunman opened fire on Saturday in a crowded Walmart store in El Paso, a majority-Hispanic border city, killing at least 20 people and injuring 26 others. One suspect, a white man in his early 20s, is in custody.

Law enforcement officials are studying an anti-immigrant manifesto that was posted online shortly before the attack to determine whether it was written by the suspect.

And in Dayton, Ohio, at least nine people were killed and 16 were wounded in a shooting early Sunday in an entertainment district. Officers shot and killed the gunman.