This was announced by the South Korean Chiefs of Staff Committee.
"The intelligence of the Republic of Korea, in cooperation with colleagues from the United States, is conducting a detailed analysis of the situation," TASS reports.
Earlier, the South Korean agency Ryonghap reported that the DPRK on September 11 and 12 tested a new long-range cruise missile.
The Indo-Pacific Command of the US Armed Forces said it intends to monitor the situation.