South Korean authorities have begun an investigation into the deadly Halloween stampede, which claimed the lives of more than 150 people.

People in Seoul’s nightlife district said crowd control measures were not in place at the time of the incident.

Some witnesses said people fell ““like dominoes”, while emergency services provided CPR at the scence.

The investigations will seek to determine why there were limited guidelines to deal with the influx of people.

Many of the victims’ families spent hours and days attempting to locate their missing relatives.

Foreigners were also killed in the incident as authorities race to identify the bodies of those who perished.

Crime scene investigators and forensics officers have arrived at the scene, as many of the local shops and businesses shut their doors.

The incident took place in the Itaewon district, which is a popular neighbourhood for tourists.

South Korea’s President Yoon Suk-yeol has declared a period of national mourning. He described the incident as “truly tragic”.