ALLEN, Texas (AP) — A law enforcement official says federal investigators are looking into whether the gunman who killed eight people at a Dallas-area mall expressed an interest in white supremacist ideology as they work to try to discern a motive. The official cautioned the investigation is in its early stages. Federal agents have been reviewing social media accounts they believe Mauricio Garcia, 33, used and posts that expressed interest in white supremacist and neo-Nazi views, said the official, who could note discuss details of the investigation publicly and spoke to the AP on condition of anonymity.