The North Korean army on Thursday threatened a possible strike against US military bases in Japan, in response to the use of nuclear-armed US B-52 bombers in joint military drills with South Korea.

"The US should not forget that the Anderson Airbase in Guam where the B-52s take off, as well as naval bases at Japan's main island and Okinawa, are all within the range of our precision target assets," a spokesman for the North's supreme army command said in a statement carried by state media.