N.Korea celebrates the birthday of the "Great Leader" Kim Il Sung

North Koreans bowed before statues of their late "Great Leader" and danced to honor his birthday as the regime kicked out international nuclear monitors and world leaders decried its decision to restart its atomic program.

Crowds of neatly dressed people and uniformed soldiers swarmed toward ubiquitous statues of the country's founding father with bouquets of flowers to pay homage to Kim Il Sung, who died 15 years ago, state TV showed.

Wednesday's celebrations came a day after North Korea declared it will restart its nuclear program, quit disarmament talks, and boot out international inspectors because the U.N. Security Council adopted a statement condemning its April 5 rocket launch.

U.S. State Department spokesman Robert Wood told reporters Wednesday that American officials who had been helping the North disable the Yongbyon nuclear plant were now making preparations to leave.

Wood said the expulsion was "a step backward" and further isolated the country from the outside world. "The North is going to have to deal with the consequences of such decisions," he said.

Kim Il Sung's birthday is called the "Day of Sun" in North Korea and is one of the biggest national holidays, along with that of his son and current leader, Kim Jong Il.

The two Kims are the focus of an intense cult of personality in the nation of 24 million people. Their portraits hang in nearly every room, and many North Koreans wear small red lapel pins bearing the elder Kim's picture.

Kim Il Sung ruled North Korea for more than four decades until his death from heart failure in 1994. Known as the "Great Leader," he remains the country's "eternal president" even while his son now leads.

For weeks, North Korea has been leading up to the anniversary with film and music festivals, athletic competitions, art exhibitions and a flower show featuring the late founder's namesake "kimilsungia" orchid.

In a highly unusual move, two Christian bands from the U.S. — the Nashville, Tennessee-based classical-fusion Annie Moses Band and Grammy Award-winning Casting Crowns — were among musicians performing Wednesday at an international festival showcasing dancers, acrobats and musicians.

"We are there to demonstrate respect for the people and continue to establish relationships," Mark Hall, lead singer for Casting Crowns, said in a statement last week, ahead of a trip to the communist nation, long criticized for not allowing religious freedom.