SEOUL (Reuters) - North Korea said U.S. B-1B bombers flew over the Korean Peninsula on Thursday and carried out bombing drills simulating attacks on major targets in the country, the North s official KCNA news agency said on Friday. The strategic bombers, escorted by U.S. and South Korean fighter jets, flew from the Anderson Air Force Base in Guam, to conduct a  surprise  strike drill, the KCNA said. There was no immediate confirmation from the U.S. and South Korean militaries. 