Overview

• Officials say a lithium‑ion UPS battery exploded during relocation work at the National Information Resources Service in Daejeon, triggering a thermal‑runaway fire late Friday.
• The outage initially suspended 647 government systems, disrupting mobile ID, Korea Post services, major ministry websites, the pan‑government intranet and parts of 119 location tracking.
• As of Sunday morning, more than half of network devices and 99 percent of key security devices were back online, and authorities began bringing 551 unaffected systems up in phases.
• Ninety‑six systems were confirmed damaged and will be moved to the NIRS branch in Daegu, with authorities estimating about two weeks for full normalization.
• Fire crews fully extinguished the blaze on Saturday after removing and submerging nearly 400 battery packs; one worker suffered first‑degree burns, a joint investigation is underway, and officials say multi‑stage backups make significant data loss unlikely.