Overview

• Officers searched the National Information Resources Service in Daejeon and three firms tied to its uninterruptible power supply as part of the Sept. 26 fire investigation.
• Authorities previously booked one NIRS official and three outsourced workers linked to the UPS relocation on suspicion of professional negligence.
• Forensic teams identified lithium‑ion batteries in the UPS as the source of the NIRS blaze, which occurred during a relocation to the facility’s basement.
• Only 115 of 647 affected government IT systems were restored as of 4 p.m. Thursday, and the Interior Ministry enlisted ETRI, KIST, Samsung SDS and LG CNS with a goal to restore power units within 10 days.
• A separate fire at Lotte Innovate’s Daejeon data center started at 4:59 a.m. and was extinguished by 5:38 a.m., with officials suspecting a UPS battery module after the site had undergone an emergency safety inspection this week.