"I give advance warning that reoccurrence of such provocation as violating the inalienable sovereignty of the [North] will surely provoke a terrible response," said Kim Yo-jong, the sister of the reclusive country's leader Kim Jong-un, according to the state-run Korean Central News Agency (KCNA).
Her remarks came just a day after South Korea's Unification Minister Chung Dong-young expressed regret over drones allegedly sent by civilians to the North, without specifying which incidents he was referring to.
KCNA quoted her as saying it was "fortunate" that the South had expressed regret, calling it "sensible behavior."
She added, "We don't care who the very manipulator of the drone infiltration into the airspace of the DPRK is and whether it is an individual or a civilian organization."
Earlier in January, the North said it shot down a South Korean surveillance drone near the industrial town of Kaesong, dealing a blow to Seoul's efforts to mend relations with Pyongyang.
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