At least 146 people were killed in a stampede when a huge crowd celebrating Halloween crammed into an alley in a night life area of the South Korean capital Seoul on Saturday night, emergency officials said, APA reports citing Reuters.

A further 150 people were injured in the crush in Seoul's Itaewon district, Choi Sung-beom, head of the Yongsan Fire Station, said in a briefing at the scene.

Many of the injured were in serious condition and receiving emergency treatment, the officials said. Many of the party-goers were wearing masks and Halloween costumes.

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At least 59 people were killed and 150 injured in a stampede after a crowd poured into a central district of the South Korean capital Seoul for Halloween festivities on Saturday night, a fire official said, APA reports citing Reuters.

The incident took place at about 10:20 p.m. (1320 GMT). A large number of people fell down in a narrow alley during the Halloween events, Choi Sung-beom, head of the Yongsan Fire Station, said.

The number of casualties could rise as the rescue effort was still under way.

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Dozens of people were injured in a stampede in Seoul as a huge crowd poured into a central district of the South Korean capital for Halloween festivities late on Saturday, the Yonhap news agency reported, APA reports citing Reuters.

Fire authorities were administrating CPR to at least 50 people in the Itaewon district as of 11:30 p.m. (1430 GMT) on Saturday, according to the news agency.

Social media footage showed several people being assisted by rescue officials and private citizens at the scene. Reuters could not verify authenticity of the footage.

South Korea's President Yoon Suk-yeol ordered the dispatch of emergency medical team to the area and said hospital beds should be prepared to minimise casualties, his office said.