Border Patrol agents were ambushed by an active shooter when they arrived at the Border Patrol annex facility in McAllen, Texas on Monday morning, law enforcement has said. No federal officers were shot in the incident; however one McAllen, Texas police officer was struck and is in stable condition. The gunman was shot and killed by officers on the scene and has been identified as Ryan Louis Mosqueda. According to Fox News' Bill Melugin, "Three federal & TX law enforcement sources tell me an active shooter with a rifle & tactical gear ambushed Border Patrol agents as they arrived at...