SEOUL, Oct 30 — South Korea's President Yoon Suk-yeol declared a period of national mourning today after a Halloween crush killed some 151 people in a packed nightlife area in Seoul.

Yoon expressed condolences to the victims and wishes for a speedy recovery to the injured.

"This is truly tragic," he said in a statement. "A tragedy and disaster that should not have happened took place in the heart of Seoul last night."

A huge crowd celebrating in the popular Itaewon district surged into an alley on Saturday night, emergency officials said, adding the death toll could rise.

A further 76 people were injured in the melee, Choi Sung-beom, head of the Yongsan Fire Station, said in a briefing at the scene.

Nineteen of the injured were in serious condition and receiving emergency treatment, the officials said. — Reuters