Authorities are investigating a motive behind the deadly car crash into a crowd of migrants in Brownsville, Texas, leaving at least eight dead and nine injured. https://gma.abc/3nH79Ky SUBSCRIBE to ABC News on YouTube: https://bit.ly/2vZb6yP Latest updates: http://abcnews.go.com/ Watch FULL EPISODES on Hulu: http://abcn.ws/3bzvQQn #brownsville #texas #abcnews