By Li Hongmei

Supreme military command of the Democratic People's Republic of Korea (DPRK) said on Thursday its "precision attack" weapons have U.S. navy bases in Guam and Okinawa in their sights and will attack them if it is provoked.

"The United States is advised not to forget that our precision target tools have within their range the Anderson Air Force base on Guam where the B-52 takes off, as well as the Japanese mainland where nuclear powered submarines are deployed and the navy bases on Okinawa," the DPRK command spokesman was quoted by KCNA news agency.

Pyongyang earlier made a threat to stage a nuclear attack on the United States, something that is well outside of its current military capacity, although the U.S. Pacific bases are in range of its medium range missiles.

The DPRK has responded angrily to reports that the United States has flown B-52 bomber sorties over the Korean peninsula as part of the annual military drills with South Korean forces.

Media reports also said that South Korea's Unification Ministry issued a press release saying that the DPRK had issued an air raid warning according to a radio broadcast monitored in Seoul.

According to the Yonhap News Agency the warning was issued at 00:32 GMT and carried a message to military units to stand ready and enter a state of full military preparedness, however the action appeared to be a drill under an air raid scenario.

The DPRK has been conducting large-scale military drills coinciding with annual exercises by the South Korean and U.S. forces scheduled for the end of April.

On the other hand, the U.S. and its allies have attempted to stress that the military drills, which are heightening tensions in the region, are strictly defensive in nature.