LONDON, March 3 : The World Endurance Championship (WEC) called off its season-opening race in Qatar on Tuesday as a result of U.S. and Israeli attacks on Iran and the closure of airports in the region including Doha. The Qatar 1812km race had been scheduled for March 26-28 at the Lusail International Circuit outside Doha, which is also used by MotoGP and Formula One. The endurance season, which has the 24 Hours of Le Mans as its showcase event in June, will now start with the Six Hours of