South Korea began demanding a formal apology and “responsible measures” from Pyongyang over the September 21 blast in the western Demilitarized Zone, according to The Guardian.

The US-led United Nations Command concluded there was an Armistice Agreement violation, according to Al Jazeera. Kim Yo-jong denied that North Korean soldiers had crossed the border and warned border units would carry out “immediate and merciless retaliation” if South Korean troops fired on Northern soldiers. Three South Korean soldiers were injured in the two blasts, according to Al Jazeera.