Zurich: FIFA is investigating the behavior of around 200 Croatian fans who formed a giant human swastika during Wednesday's friendly international in Italy."According to the pieces of information gathered to date, some Croatian fans formed a swastika and made the Nazi salute in the stands," world soccer's governing body said on Friday.A committee is now investigating whether this violated FIFA's disciplinary code regarding racism. A FIFA spokesman did not know how long the investigation would take.The supporters arranged themselves into the Nazi symbol about 30 minutes into Croatia's 2-0 win at Livorno's Armando Picchi stadium. Many also gave Nazi salutes.The Croatia fans claim to have been incited by the jeering of their national anthem and waving of flags of the old communist Yugoslavia. Croatia fought a bloody war for independence from the old federation in 1991-95.