Gimpo3 self-propelled howitzers aimed south from Kaepung on Monday.
They follow September landmine blasts that injured 3 South Korean soldiers, which Seoul blames on Pyongyang.
Kim Yo-jong announced border loudspeakers Thursday, an armored vehicle appeared Friday, and the 122-millimeter guns followed Monday.
North Korea denies causing the blasts and accuses the South of harassing its soldiers in the Demilitarized Zone.
Both Koreas have written to the UN Security Council president, and Seoul demands an apology.
How each outlet framed it
drawn from 100+ reports worldwide
- KBS WORLD Radio leans critical
- builds the story from a Gimpo tourist's reaction at the Aegibong observatory, not the military detail alone
Sources: KBS WORLD Radio