North Korea has recently moved two additional missile launchers, believed to be for Scud missiles, to its east coast, South Korea's Yonhap news agency reported Sunday, quoting a military source familiar with the matter.

Yonhap said the move is yet another sign of preparations for a missile launch at a time when the security climate on the Korean Peninsula is already volatile.

The report said satellite imagery released after Tuesday, a day after the April 15 celebrations of the 101st anniversary of the birth of late founder Kim Il Sung, showed that two additional mobile launchers for short-range Scud missiles were moved to Wonsan and South Hamgyeong Province at its eastern coast.