(ABC NEWS) -- A large tremor measured at magnitude 4.9 was detected in North Korea and governments in the region are trying to determine whether it was a
nuclear test that the North Korean regime has vowed to carry out despite
Japan's prime minister has called an urgent security meeting, according to chief government spokesman Yoshihide Suga, and South Korea raised its military alert level, the AP reported.
The Comprehensive Test Ban Treaty Organization told ABC News, "We
confirm that a suspicious seismic event has taken place in North Korea."
The agency said it was trying to confirm the nature of the tremor.
In January, North Korea threatened to carry out a "higher-level" test following its successful Dec. 12 long-range rocket launch.
Suspicions were aroused when the U.S. Geological Survey said it had detected a magnitude 4.9 earthquake Tuesday in North Korea.
North Korea threatened in January to carry out a "higher-level" test
following the Dec. 12 rocket launch. At the time, North Korea's new
leader Kim Jong-Un said his country's weapons tests were specifically
targeting the United States.
The suspicious tremor comes just hours before President Obama is to give
the State of the Union address, and it marks the first diplomatic test
in the region for new Secretary of State John Kerry.
China, North Korea's main ally in the region, has warned North Korea it
would cut back severely needed food assistance if it carried out a test.
Each year China donates approximately half of the food North Korea
lacks to feed its people and half of all oil the country consumes.
By Gloria Riviera and Akiko Fujita