Oil prices fell back after rising earlier on escalating tensions in the war between the U.S. and Iran. HONG KONG (AP) — World shares were mixed Tuesday, following losses on Wall Street after U.S. stocks retreated from record highs. Oil prices fell back after rising earlier on escalating tensions in the war between the U.S. and Iran. U.S. futures edged more than 0.2% higher. In early European trading, Britain’s FTSE 100 fell 0.8% to 10,280.87. France’s CAC 40 was up 0.6% to 8,026.89, while