HONG KONG (AP) — World shares retreated and oil prices fell back Friday as the fragile ceasefire with Iran was strained by missile and drone attacks that prompted U.S. retaliatory strikes on Iranian military facilities. U.S. futures rose despite the latest flare up in the conflict. The future for the S&P 500 gained 0.5%, while that for the Dow Jones Industrial Average was up 0.3%. Investors are closely watching the war situation as negotiations between the U.S. and Iran to end the war make