Hours ahead of President Joe Biden’s visit on Monday to New Orleans — his first since the violent attack on New Year’s Day that left 14 people dead — law enforcement officers swarmed a blockaded Jackson Square, where Biden and his wife, first lady Jill Biden, were expected to attend an evening prayer and memorial service at St. Louis Cathedral.

In New Orleans, the driver plowed into a crowd on the city’s famous Bourbon Street. Fourteen revelers were killed along with the driver. Shamsud-Din Jabbar, who steered his speeding truck around a barricade and plowed into the crowd, later was fatally shot in a firefight with police.

Biden said he was briefed by the FBI, which informed him the suspect’s truck contained a remote detonator to set off explosives planted within two ice chests in the French Quarter hours before the truck attack (the explosives were later identified and rendered safe by authorities).