FBI officials said the shooting was being investigated as an “act of targeted violence” against immigration agents, citing evidence including a shell casing reading "ANTI ICE" and letter that says "H...

What exactly motivated a shooter who authorities say opened fire on a U.S. Immigration and Customs Enforcement facility in Dallas, killing one detainee and wounding two others before taking his own l...

"What he did is the very definition of terrorism," she added.