In South Korea, rescue officials speak of cardiac arrest until a doctor has officially pronounced a person dead.
A fire department spokesman confirmed the incident, saying 140 ambulances had been dispatched to the scene to attend to the victims.
About 50 people suffered a cardiac arrest in the Itaewon district, where thousands of people were celebrating Halloween, according to the Yonhap agency.
The victims seem to have been caught in crowd movements in this district where Halloween celebrations bring together a large number of people in the South Korean capital.
South Korean President Yoon Suk-yeol has called for hospitals to be prepared to receive the injured, the presidency said.
Photographs released by Yonhap showed more than a dozen people lying in a street, with rescuers performing CPR on some of them, as police cordoned off the crowds.
According to video footage, around 20 bodies were covered in sheets or blankets, however, as rescuers made no attempt to revive them. Other victims were evacuated on stretchers to ambulances.
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