President Park Geun-hye said Friday that South Korea is taking strong countermeasures against North Korea over its hydrogen bomb test.

She also called for the people's unity at a time when South Korea "is closely coordinating with the international community" on how to handle the North's latest provocation.

Tensions are high on the Korean Peninsula over South Korea's anti-Pyongyang broadcasts along the heavily fortified border with North Korea.

South Korea resumed the propaganda broadcasts at noon in retaliation against North Korea over the fourth nuclear test.

South Korea previously stopped the propaganda broadcasts five months ago under a deal that defused tensions sparked by land-mine blasts near the border blamed on North Korea.

In August, South Korea resumed the propaganda broadcasts along the border for the first time in 11 years in retaliation for the North's land-mine attack that maimed two South Korean soldiers.

The two Koreas later held days of intensive high-level talks and produced a deal in which South Korea agreed to stop propaganda broadcasts unless an abnormal situation occurs. (Yonhap)