Investigators examine the site where an aging overpass set for demolition partially collapsed in Seoul on Wednesday, a day after an accident left three people dead. YONHAP NEWS AGENCY

An investigation team has been formed to look into the overpass collapse in Seoul on Tuesday, which killed three people, the Republic of Korea's prosecutors said.

"We will work closely with related agencies, including police and labor authorities, to thoroughly investigate the cause of the accident and determine responsibility," the Seoul Western District Prosecutors' Office said in a media notice on Wednesday, according to Yonhap News Agency.

The prosecutors' office also said that it will ensure prompt support for the victims.

The announcement came after the ROK President Lee Jae-myung ordered a comprehensive investigation into the accident on Tuesday and instructed officials to devise preventive measures against a recurrence.