A special police team investigating the Itaewon crowd crush will summon the chief of the Yongsan Fire Station for questioning next week.

According to the police on Thursday, the special team decided to question Yongsan fire chief Choi Seong-beom as a suspect on charges of professional negligence resulting in death and ordered him to appear for questioning on Monday.

Facing charges since last Monday for failing to swiftly issue a response alert and deciding that a joint response with police was unnecessary despite being specifically requested, Choi will now be questioned over allegations that he did not properly monitor or manage safety risks.

Former Yongsan police chief Lee Im-jae, who faces the same charges as Choi of professional negligence resulting in death and dereliction of duty, is also set to face police questioning on Monday.

Lee is accused of arriving at the police station in Itaewon near the deadly site at 11:05 p.m., about 50 minutes after the fatal crowd crush was reported to have occurred.

Meanwhile, the special team announced that an investigation has been opened on charges of negligence resulting in death and dereliction of duty against interior and safety minister Lee Sang-min after a firefighters union filed a complaint with the police on Monday.