North Korea held a mass celebration to mark the closing of the four daylong ruling party congress in central Pyongyang on Tuesday, attracting leader Kim Jong-un and the party's newly appointed group of top echelons.

The ruling Worker's Party of Korea congress that concluded Monday gave Kim the chairmanship at the party and revised the party's rules to further consolidate Kim's status as the supreme party leader.

The revised rules also stipulate that as the WPK's chairman, Kim represents and leads the whole party, officially allowing him an even tighter control over all aspects of the country.

The new title adds to Kim's already long list of top positions that he has been given since assuming power following the sudden death of his father in late 2011, including the first chairman of the National Defense Commission and the supreme commander of the Korean People's Army.

"The Pyongyang mass rally and procession began at Kim Il-sung Square Tuesday in celebration of the successful 7th Congress of the WPK," the North's Korean Central News Agency said in an English dispatch.

Kim attended in a black Mao suit before the applauding crowd as the event began earlier in the day, according to the rally's live broadcast by the (North) Korean Central TV Broadcasting Station, monitored in Seoul.

The event brought together all the members of the WPK's five-member politburo, who were newly elected in the latest congress -- Kim, Kim Yong-nam, Hwang Pyong-so, Pak Pong-ju and Choe Ryong-hae -- as well as other top members of the ruling party.

Delivering a speech at the rally, Kim Yong-nam, North Korea's nominal head representing the Supreme People's Assembly, hailed the latest party congress.

"The 7th congress of the WPK has been a convention of victory and honor, a new watershed in our struggle to further strengthen our party and fulfill the tasks of bringing in the Juche (self-sufficient) revolution," Kim said.

 He said the country's military-first policy and its standing as the "strongest military power" could successfully fend off sanctions and joint military exercises by the United States and its "worshipers."

Kim also touted the military's latest development of submarine-launched ballistic missiles, nuclear weapons and intercontinental ballistic missiles as having shown off the North's grandeur as a nuclear power. (Yonhap)