Immigration suspect taped Texas landmarks By Jack Douglas Jr. Star-Telegram Staff Writer Police in Dallas, Houston and Austin are on increased alert after the arrest of a Pakistani man who had videos of buildings, transit systems and a dam in Central Texas. But state officials said Tuesday there was "no known credible threat" of a terrorist plot in Texas following the July 20 arrest in Charlotte, N.C. of Karman Akhtar, 34, also known by the last name Shaikh. Akhtar has drawn the attention of state and federal terrorism investigators but is being held in North Carolina only on federal charges...