Gunfire erupted last night on Bourbon Street as thousands gathered to celebrate Mardi Gras. Four shots rang out sending everyone running for safety. Screams also rang out following the shots as people frantically ran into one another. Two men and two women were wounded in the chaos, one of whom were critically injured and underwent surgery. Police believe the shooting was a result of an argument and people were spotted running away, but no arrests have been made. Once the shooting stopped, people flooded back to the street like nothing happened. Watch more below.