During major events such as New Year’s or Mardi Gras, the source said, city security plans call for parking large vehicles at the ends of Bourbon Street that are most vulnerable to high-speed vehicle attacks. But such measures, the person said, are not practical on a daily basis in the crowded tourist zone.

Family members and friends have begun identifying the 14 people who died in the truck-ramming attack early Wednesday morning on Bourbon Street in New Orleans.