Kim Yo-jong - first vice department director of the Central Committee of the Workers' Party of Korea, younger sister of North Korean leader Kim Jong-un - said that Pyongyang intends to take the 'next step' against South Korea, Yonhap reported.

"I feel it is high time to surely break with the South Korean authorities. We will soon take a next action," Kim Yo-jong, first vice department director of the Central Committee of the Workers' Party of Korea, said in a statement carried by the North's Korean Central News Agency.

"By exercising my power authorized by the Supreme Leader, our Party and the state, I gave an instruction to the arms of the department in charge of the affairs with enemy to decisively carry out the next action," the statement said.