A South Korean man involved in planning an outdoor pop concert where 16 people were killed after falling through a ventilation grate was found dead Saturday in an apparent suicide, officials said, as doctors treated eight others facing life-threatening injuries from the disaster.

The man, 37, an employee of the Gyeonggi Institute of Science and Technology Promotion, was found dead at around 7 a.m. in Seongnam, the city south of Seoul where Friday’s accident occurred, said city spokesman Kim Nam-jun.

The site of his death was not far from where 16 people watching a performance by 4Minute, a girls band that is popular across Asia, were killed when the ventilation grate they were standing on collapsed. Eleven other people were seriously injured.

It was believed that the man, who was questioned by police Friday night over the accident, leaped from the top of a 10-story building, police inspector Park Jeong-ju said.

Gyeonggi Institute of Science and Technology Promotion was one of the sponsors of the concert, which was organized by the news site Edaily and was part of a local festival. About 700 people had gathered to watch the concert, which was abruptly halted after the accident happened.

In a televised briefing on Saturday, Kim said there was a possibility that the death toll from the accident could rise. Of the 11 people treated at hospitals, eight were dealing with life-threatening injuries to the abdomens or lungs, he said.

Most of those who were killed were men in their 30s and 40s, while five were women in their 20s and 30s, fire officials said.

Photos of the accident scene showed a deep concrete shaft under the broken grate. Kim said it was believed that the grate collapsed under the weight of the people.

A video recorded by someone at the concert that was shown on the YTN television network showed the band continuing to dance for a while in front of a crowd that appeared to be unaware of the accident.

Dozens of people were shown standing next to the ventilation grate, gazing into the dark gaping hole where people had been standing to watch the performance. YTN said the ventilation grate was about 3 to 4 meters (10 to 12 feet) wide. Photos apparently taken at the scene showed that the ventilation grate reached to the shoulders of many passers-by.

The collapse came as South Korea is still struggling with the aftermath of a ferry disaster in April that left more than 300 people dead or missing.

For a time, the sinking jolted South Korea into thinking about safety issues that had been almost universally overlooked as the country rose from poverty and war to an Asian power.

The tragedy exposed regulatory failures that appear to have allowed the ferry Sewol to set off with far more cargo than it could safely carry. Family members say miscommunications and delays during rescue efforts doomed their loved ones.

Analysts say many safety problems in the country stem from little regulation, light punishment for violators and wide ignorance about safety in general — and a tendency to value economic advancement over all else.