Austin Mayor Kirk Watson called the mass shooting a “traumatic moment,” urging residents to care for one another as the FBI investigates possible terrorism links and officials mourn the victims. ––– Subscribe to ABC News on YouTube: https://abcnews.visitlink.me/59aJ1G ABC News is your daily source of breaking national and world news, exclusive interviews and 24/7 live streaming coverage. https://abcnews.com Download the ABC News app for the latest headlines and alerts: https://abcnews.com/