A press release read out at the press conference accused the U.S. of still keeping mum about the truth about the warship case.

The truth about the warship case should be probed without fail to achieve peace on the Korean Peninsula and, to this end, the U.S. should opt for probing the truth as early as possible, it held.

The press release demanded the U.S. clarify, among other things, the linkage of the Key Resolve and Foal Eagle joint military exercises aimed at invading the DPRK with the "Cheonan" case.

It urged the U.S. to open to the public all information about the case as it perfectly knows about the situation in the waters where the case occurred at that time.