Houston Marine Fire Department boat on scene of a tug boat fire around 2 a.m., Feb. 26, 2016.  (U.S. Coast Guard photo by Petty Officer Joseph Mccune) HOUSTON — The Coast Guard Captain of the Port closed the Houston Ship Channel with a safety zone near Interstate 610 from 12:15 a.m. to 2 a.m. Friday, as their crews and local fire departments responded to a tugboat engulfed in flames, moored at...