A select few North Korean websites went offline briefly on Monday for apparent maintenance, which one expert views as part of bigger changes to the country’s internet infrastructure as Pyongyang looks to overhaul its online activities.

The websites of the state-owned Korean Central News Agency (KCNA), the foreign ministry and Kim Il Sung University experienced outages lasting as long as 15 minutes from around 3:40 p.m. KST, while email hosting platform Silibank was also down for around 10 minutes. 

KCNA was also offline for brief spells earlier in the day, amounting to over half an hour