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South Korea Resumes Propaganda Attack On Pyongyang

South Korea has said it will retaliate for a North Korean nuclear test by resuming cross-border propaganda broadcasts which Pyongyang considers an act of war.

The South's presidential office made the announcement on Thursday, a day after the North claimed to have carried out its first hydrogen bomb test. The claim has been disputed by outside governments and experts.

The South stopped earlier broadcasts after it agreed with Pyongyang in late August on a package of measures aimed at easing animosities.

"Our military is at a state of full readiness, and if North Korea wages provocation, there will be firm punishment," Senior presidential national security official, Cho Tae-yong.

South Korea resumed the broadcasts after more than a decade when two soldiers were injured by a landmine allegedly laid by North Korea in August last year, but then relented after coming to an agreement with the North amid easing animosities.

The latest provocation from the North, met with world condemnation, has opened up old wounds on the Korean peninsula and Seoul's response comes in the form of "psychological warfare".

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The South's propaganda broadcasts, which start on Friday, will infuriate Pyongyang because they are designed to raise questions and cast doubt in North Korean minds about the fallibility of the ruling Kim dynasty.

At the height of last year's crisis, the North had issued an ultimatum for the South to halt its "psychological warfare" or face imminent attack.

Fast forward to 00:18 for South Korea's high-decibel broadcast: