HOUSTON—Three constable deputies were shot in an ambush early Saturday morning while working an extra shift at a Houston bar, leaving one deputy dead and two others wounded, authorities in Texas said. Authorities took one person into custody but were still searching for a man believed to be the shooter, Houston Police Executive Assistant Chief James Jones told reporters. The Harris County constable deputies were working at the 45 North Bar and Lounge when they responded to a disturbance outside the business around 2:15 a.m., Jones said. They were trying to arrest someone when another person with a rifle ambushed them and opened fire on the deputies from behind, Jones said, according to preliminary information from the scene. One deputy was shot in the back and another was shot in the foot, said Mark Herman, Harris County Constable Precinct 4. The third deputy was pronounced dead at the hospital. It …