North Korean leader Kim Jong Un's sister, Kim Yo Jong, has been elected a member of the ruling party's Central Committee, an official media report said Tuesday, a day after the party announced a new title of party "chairman" for the leader.

The election of Kim Yo Jong, a vice director of the Propaganda and Agitation Department of the Workers' Party of Korea, provided further evidence that Kim Jong Un has tightened his grip on power through the party's first congress in 36 years, which ended Monday.

The selection of Kim's younger sister was confirmed in a list of the 129-member committee released by the North's official Korean Central News Agency.