Japan's Chief Cabinet Secretary Hirokazu Matsuno stated that North Korea is carrying out a nuclear test, adding that the Japanese government plans to activate the J-Alert nationwide.
Matsuno voiced concerns that the North may take further provocative actions that include doing a nuclear test.
He pointed out that the consideration followed early warnings about a North Korean missile launch that were issued through the system Thursday.
"Related government ministries and agencies are jointly considering remedial measures," Matsuno, Japan's top government spokesman, told a press conference.
Additionally, the spokesman stressed that there was no problem with how the government responded to the missile firing.
"In the midst of various information reaching us, we issued (warnings) through J-Alert as quickly as possible."
J-Alert is a satellite-based system designed to send emergency information, such as missile and tsunami warnings, from the Japanese government to municipalities across the country.
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