NEW : NTSB says one section of bridge shifted 50 feet as it fell . Comment: `` We chose the inspection route , and began in May , '' he said , adding that officials intended to replace the bridge about 2020 . Investigators to examine video that may show another view of the collapse .
NEW : NTSB says one section of bridge shifted 50 feet as it fell . Comment: Investigators to examine video that may show another view of the collapse .