By JON GAMBRELL, Associated Press DUBAI, United Arab Emirates (AP) — The U.S. blamed Iran for suspected attacks on two oil tankers Thursday near the strategic Strait of Hormuz, denouncing what it called a campaign of "escalating tensions" in a region crucial to global energy supplies. The U.S. Navy rushed to assist the stricken vessels in the Gulf of Oman off the coast of Iran, including one that was