North Korea checks in

As an update to yesterday's news, North Korean officials say that last Thursday's explosion was not nuclear. Rather, they say, it was part of a construction project to build a hydro-electric dam in the remote mountainous region of Ryanggang, on the Chinese border.

The BBC asked North Korean Foreign Minister Paek Nam-sun why North Korea hadn't explained earlier about the blast. He said it was because all foreign journalists were liars.