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South Korea's unification ministry on Thursday called on North Korea to stop acts that could raise the risk of border clashes, after Pyongyang warned of resuming loudspeaker broadcasts against the South. The ministry urged the North to return to dialogue to resolve the issue, saying such moves violate the Korean War Armistice Agreement near the Military Demarcation Line, Yonhap and KBS World report. Kim Yo-jong, the North Korean leader's sister, warned of "new counter means" along the border, saying propaganda loudspeakers would be ready within days, according to Yonhap and the Korea Times. Meanwhile, the main opposition People Power Party renewed calls for the government to resume its own loudspeaker broadcasts in response to recent mine blasts in the Demilitarized Zone, Yonhap reports.