A Finnish state website came under cyber-attack on Wednesday afternoon, a day after Russian hackers claimed similar interference with the Parliament website.
A group calling itself Noname057(16) said it was the perpetrator of both attacks.
The latest target was a relatively obscure Valto, a government joint publication archive. Valto is maintained by the National Library.
It crashed on Wednesday after being bombarded with spurious service requests.
The Council of State said on Twitter at around 4:20 pm that the site might not be working properly or that access to it might be blocked. Its publications were also not displayed on various ministry websites.
Half an hour later it announced that the site is working normally again.
The Russia-based hacker group announced on its Telegram channel that it had carried out the disruption. The post did not give any reason as to why that particular site was selected as a target.
Incidents may be Nato-linked
After Tuesday's incident, the group said on Telegram that it " decided to make a 'friendly' visit to neighbouring Finland, whose authorities are so eager to join Nato".
Late Tuesday Finnish time, US President Joe Biden signed off on Finland's accession to the military alliance. All but seven of the 30 member states have approved Finland's and Sweden's requests to join Nato.
On Wednesday morning, the National Bureau of Investigation (NBI) said it had launched an investigation into Tuesday's interference with the parliamentary site.
The agency said the attack originated from dozens of IP addresses scattered around the world, without providing more detail.