Mardi Gras in New Orleans - one of the biggest parties of the year.<br/> <br />But on Saturday night, four people were wounded when gunfire broke out on Bourbon Street.<br/> <br />One man was in critical condition and undergoing surgery, while another man and two women were in stable condition.<br/> <br />Police believe the shooting stemmed from an argument, but said they hadn't identified a suspect.<br/> <br />Every year crowds gather in the city's French Quarter for the celebrations, culminating on Fat Tuesday, which this year falls on February 12.
