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South Korea's unification ministry on Thursday called on North Korea to stop border escalation acts and return to dialogue after Pyongyang warned of resuming loudspeaker broadcasts, saying such moves increase the risk of accidental clashes. The government said it would take a 'proportionate measure' if the North resumes the broadcasts, without detailing specifics. The main opposition People Power Party renewed calls for Seoul to resume its own loudspeaker broadcasts in response to recent mine blasts in the Demilitarized Zone. Yonhap reports the North's threat was announced by Kim Yo-jong, a senior official, on Wednesday.