Authorities investigate a shooting in the parking lot of the Twin Peaks restaurant Sunday in Waco, Texas. Bikers say that most of the 170 people arrested had nothing to do with the violence. Jerry Larson/AP hide caption

itoggle caption Jerry Larson/AP

Authorities investigate a shooting in the parking lot of the Twin Peaks restaurant Sunday in Waco, Texas. Authorities say the shootout victims were members of rival biker gangs that had gathered for a meeting. Jerry Larson/AP hide caption

itoggle caption Jerry Larson/AP

Donnell Brown and another cowboy move a grouping of bulls from one pen to another on rib-eye ultrasound day in March at the R.A Brown Ranch. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

State police officers patrol a highway between Ciudad Victoria and Matamoros, in northeast Mexico, in 2011. Mexico's drug and turf wars have descended on the once tourist friendly border town of Matamoros. Alexandre Meneghini/AP hide caption

itoggle caption Alexandre Meneghini/AP

A riot late last month forced officials to close the Willacy County Correcitonal Center in Wallcy County, Texas. John Burnett/NPR hide caption

itoggle caption John Burnett/NPR

At SXSW 2014, pop star Lady Gaga performed on a stage made to look like a five-story-tall Doritos vending machine, which won't be returning this week. Kevin Mazur/WireImage/Getty Images hide caption

itoggle caption Kevin Mazur/WireImage/Getty Images

A platform owned by Mexico's state-run oil company Pemex is seen off the Bay of Campeche in the Gulf of Mexico. The country has recently opened up its energy sector to foreign investors. Victor Ruiz/Reuters/Landov hide caption

itoggle caption Victor Ruiz/Reuters/Landov