North Korea has turned back on propaganda broadcasts along the inter-Korean border to counter South Korea's loudspeaker campaign, officials here said Tuesday.

The North is blaring anti-South Korean broadcasts that include direct criticism of President Park Geun-hye, they said.

"The North is criticizing our president by name," a Defense Ministry official said, referring to North Korea's border broadcasts being aired at some 10 locations along the tensely guarded shared border.

The North Korean broadcasts are mostly broadcasting internal messages idolizing leader Kim Jong-un, encouraging allegiance to his leadership and legitimizing the latest nuclear test, the official said on the condition of anonymity.

Last week, South Korea resumed anti-Pyongyang broadcasts in retaliation for the communist neighbor's test of what it claims was a hydrogen bomb. 

The two Koreas agreed in 2004 to halt psychological warfare using loudspeakers.

The North Korean broadcasts are barely audible from the South Korean side of the border, possibly due to a lack of power or poor performance of the loudspeakers, facts based on which Seoul concluded that the North's broadcasting is designed only to muffle out South Korean broadcasts. 

Over Seoul's broadcasting campaign, which marks the fifth day since its relaunch, North Korea has shown no particular response so far, the military official said.

"Our military's anti-North loudspeaker broadcasts are reaching far and wide in North Korea," the official said, highlighting the effect of the psychological warfare operation in pressing the North.

On Sunday, the U.S. flew its bunker-busting B-52 bomber in the skies of South Korea as the allies took counteractions to deter North Korea from making additional military provocations.

Seoul previously resumed the loudspeaker operations at the border in August after two South Korean soldiers were maimed by a land mine planted by the North. 

North Korea fired shells at the South in anger over the broadcasts before the two Koreas struck the so-called "Aug. 25" agreement to end military tensions and facilitate dialogue. (Yonhap)