Mardi Gras has been deemed the highest threat level under the Department of Homeland Security's Special Event Assessment Rating system for the first time, in response to the Jan. 1 vehicle attack on Bourbon Street that killed 14.

As New Orleans kicks off its extravagant Carnival season this week, Louisiana is launching a new investigation into the New Year’s Day massacre that killed 14 people while the city will get more federal resources to help prevent another horrific attack.

Parades are set to commence Monday less than a week after a deadly truck attack killed 14 people and injured dozens in what FBI officials have called an "act of terror."