21.   Brennan refused to release the contents of the writings.

22.   But officials are leaving it up to the family to release the contents, he said.

23.   He said the leader of the arned group send an ultimatum to the United Nations, but contents were not released.

24.   Kim Yong-kyu, a spokesman for the U.N. command, confirmed receiving a letter from the North, but did not release its contents.

25.   The contents were not released.

26.   Their exact contents were not released.