The night started out ripe for celebrating the new year as the party pulsing down Bourbon Street in New Orleans drew revelers from near and far.

The FBI now says the New Orleans truck attack acted alone when he drove a pickup truck into a crowd of New Year’s revelers, killing 14 people.

At a Mass celebrated Sunday at New Orleans' St. Louis Cathedral, a church leader asked for prayers for the victims and their families, and acknowledged the sense of unease that remains.