The fire started Sunday afternoon (Korean time) on the fourth floor of the building, which contains the back-up data center for the Korean manufacturer. Some credit card related services were met with the error message. The company's main data center is located in Suwon and was not affected.
Korean media reports that there were no fatalities in the blaze. And as we said, things have returned to normal as far as Samsung.com is concerned. Looking at the video below, the result could have been much worse.
source: Samsung (translated), YTN, wikitree via Engadget