North Korea declared Tuesday that it had carried out a test of a nuclear bomb after the detonation was detected by the U.S. Geological Survey.
The explosion was registered as a 5.1-magnitude seismic event by the USGS at 9:57 p.m. ET Monday.
The U.S. Office of the Director of National Intelligence said in a statement that it had assessed that North Korea "probably conducted an underground nuclear explosion in the vicinity of P'unggyethe" with a yield of "several kilotons."
In a statement, President Barack Obama described the test as a "highly provocative act."
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