The South Korean spy agency told the lawmakers that the North Korean investigation of the military political bureau is continuing, and is spearheaded by senior Workers' Party official Choe Ryong Hae, who was the military's top political officer before Hwang.
North Korean leader Kim Jong Un is tightening his authoritarian grip on civilian life in the country, with South Korean intelligence services reporting new measures created to increase control over the population.
The NIS also reported that the North has been focusing on forestalling a possible negative impact of the tightening worldwide sanctions on public sentiment.
South Korea and the United States agreed on Friday to keep working for a peaceful end to the North Korean nuclear crisis, but a USA envoy said it was hard to gauge the reclusive North's intentions as there has been "no signal".
The visit is seen as an effort by Xi to explore a new approach in relations and likely also reflects Xi's desire to head off further pressure from Washington.
Quake of magnitude 6.4 strikes near New Caledonia
The United States Geological Survey said the quake struck 51 miles east of the Loyalty Islands at 9.43am local time (10.43pm GMT).
Han did not give details about when or if North Korea would test another missile but said it did not plan to give up its program. Ryu and her husband, Choe Tok-sin, who served as a foreign minister in South Korea during the 1960s, emigrated to the United States before defecting to the North in 1986. The isolated state has been under crippling sanctions due to its provocations, including its sixth and most powerful nuke test on September 3. Beijing is opposed to measures that could bring down Kim's regime and lead to a refugee crisis along its border, and while enforcing harsh new United Nations sanctions targeting North Korea's sources of foreign currency it has called for steps to renew dialogue. The festival was cancelled at the last minute this year and now Pyongyang banned gatherings involving drinking and singing, according to South Korea's spy agency.
China opposes the deployment of the Terminal High Altitude Area Defense missile system, or THAAD, in South Korea, believing that the system's radar would enhance the US ability to spy on its territory. Song arrived on Friday but it is not clear how long he will be in North Korea. Song's trip comes just a week after US President Donald Trump visited Beijing as part of an Asia tour, where he pressed for greater action to rein in North Korea, especially from China, with which North Korea does 90 percent of its trade.
Song is the first ministerial-level Chinese official to visit North Korea since October 2015, when Politburo Standing Committee member Liu Yunshan delivered a letter to Kim from Xi expressing hopes for a strong relationship, although the respite in frosty ties proved short-lived.
Song heads the Communist Party's International Department.
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