North Korea commemorated the 63rd anniversary of the Korean War with a mass rally on Tuesday (June 25) at Pyongyang's Kim Il-Sung Square.

The Korean War started on June 25, 1950, when Communist North Korean troops launched a surprise attack on South Korea.

U.S.-led United Nations forces battled Chinese and Soviet-backed North Korea, in which three million soldiers and civilians were killed and five million became refugees.

Hundreds attended the rally, including senior party and state officials, the video filmed by KCNA showed.

People at the mass rally held up anti-U.S. posters, including ones that read "Down with U.S. imperialists".

Tensions on the peninsula reached their peak in February when North Korea threatened nuclear and missile strikes against South Korea and the United States after U.N.-imposed sanctions for a nuclear weapons test.

Presented by Adam Justice