It was just after 1:30 Tuesday morning when Baltimore Mayor Brandon Scott (D) says he received the call from the city’s fire chief. “He said, ‘Sir, the Key Bridge collapsed,’’ said Scott, who was awake with a three-month-old child when the call came in. “I said, ‘Repeat that.’ He said, ‘The Key Bridge collapsed, a ship hit it, it’s gone, sir.’ ” Scott, 39, said he threw on his official Baltimore city jacket and headed for the scene, calling the governor, the presidents of the state Senate and city council and the city administrator along the way. When he arrived...