North Korea on Tuesday afternoon fired four more projectiles into the East Sea from a new 300-mm multiple rocket launcher with an estimated range of 180 km.
A Defense Ministry official here said the North fired four rockets from the Hodo Peninsula in Wonsan, Kangwon Province in a northeasterly direction. They flew 155 km and fell into open waters.
In the morning the North fired three rockets presumably from a 240-mm MRL from the same area. They fell into the sea about 50 km away.
Military authorities believe the firings came in response to the entry of the U.S. nuclear-powered attack submarine Columbus into Busan Port on Monday ahead of the annual combined field training exercise of South Korea and the U.S.
The new rocket launcher worries the South Korean military because projectiles are capable of reaching air bases in Suwon, Chungju and Seosan, as well as U.S. military bases in Pyeongtaek and Osan.
The North has been firing a series of missiles and rockets since Feb. 21.