The world's stock markets are staging a recovery after Wednesday's heavy losses. The Dow Jones Industrial Average, which includes America's biggest companies, opened up 1.5%, or 115 points. Leading shares in London surged by 5%, or 160 points, and Paris gained rose by more than 4% on Thursday morning after heavy falls the day before. Frankfurt managed to climb 4.3% higher. But in Japan the Nikkei share index closed marginally lower, down 0.9% at 7,868.56 points, just above the 20-year lows recorded in recent days. Investors were unsure whether the more positive mood in Europe could be sustained as uncertainty continued about a possible war in Iraq.