Riot police stand guard in front of protesters in downtown Albuquerque, N.M., Sunday, March 30,2014. Hundreds of protesters marched past riot police in Albuquerque on Sunday, days after a YouTube video emerged threatening retaliation for a recent deadly police shooting. The video, which bore the logo of the computer hacking collective Anonymous, warned of a cyberattack on city websites and called for the protest march. (AP Photo/Russell Contreras)