North Korea nuclear test

Following Pyongyang's April launch of a rocket carrying what it says is a communications satellite, North Korea has now conducted an underground nuclear test over the weekend.

From the article:

...Russia's defence ministry estimated a blast of up to 20 kilotons - comparable to the American bombs that flattened Hiroshima and Nagasaki in 1945.

http://news.bbc.co.uk/2/hi/asia-pacific/8066861.stm