(AP) China says the Ministry of Environmental Protection has activated a contingency plan to begin monitoring radiation levels in provinces bordering North Korea, but says radiation levels are normal.
In Japan, meanwhile, two T-4 trainer aircraft took off from Hyakuri Air Base northeast of Tokyo, carrying a special container to collect air samples for analysis of possible radioactive materials.
Tokyo Gov. Yuriko Koike says Japan's capital city is also testing water samples and monitoring radiation levels in the air to examine possible impact from the North Korean nuclear test.
Advertisement - story continues below