#AceWorldNews says that South Korea said Pyongyang fired seven suspected artillery shells into the ocean on Tuesday.
Seoul has described the move as a provocation apparently directed against its ongoing military drills with the US, AP reported.
North Korea earlier launched six Scud-Missiles into the sea after the annual exercises began about a week ago.
Artillery shells were also fired days before the drills started.
North Korea has said the exercises are a rehearsal for invasion, but Washington and Seoul insist they are defensive.