(June 19, 2019, 1:08 PM EDT) -- DALLAS — Twitter Inc., Google LLC and Facebook Inc. on June 14 jointly filed a motion to dismiss a lawsuit alleging liability under the Antiterrorism Act (ATA) for a 2016 shooting of Dallas police officers, with the internet platform providers telling a Texas federal court that the plaintiffs have not established any connection between the shooter’s actions and their online services (Jesus Retana, et al. v. Twitter Inc., et al., No. 3:19-cv-00359, N.D. Texas)....