Hacker group Anonymous Sudan took down as many as nine Danish websites affiliated with the health sector on Sunday afternoon, following a similar cyberattack on multiple Danish airports last week.

The hacker group claimed that the denial-of-service attacks were carried out in retaliation to burning of Muslims' holy book, the Quran, by Rasmus Paludan, a far-right Swedish-Danish politician, in front of a mosque in Denmark in January.

"Some hospitals in Denmark have been attacked due to Quran burnings, and more will be attacked in the hours to come," the hacker group announced on its Telegram.

The websites that underwent cyberattacks included regionh.dk, amagerhospital.dk, bispebjerhospital.dk, bornholmshospital.dk, frederiksberghospital.dk, gentoftehospital.dk, rigshospitalet.dk, herlevhospital.dk, and andhvidovrehospital.dk.

While the group claims itself to be from Sudan, regional cybersecurity experts have expressed their doubts over the authenticity of the claim.

TrueSec, a Swedish cybersecurity firm, in its report published a week ago said it is almost certain that Anonymous Sudan, unlike its claim, is a Russian hacker group connected with the Russian government.

Comment: That's even less believable than the Jihadi-hackers!

It backed their claim by stating that the group's Telegram account, which it uses for official announcements, is operated from Russia, the group's mode of languages are in Russian and English, and its messages are promoted by prominent accounts of the Russian hacking community.

Comment: That's some top investigatory work there...

Meanwhile, in reaction to multiple cyberattacks, Copenhagen health authority in a post on Twitter directed users to an emergency page on Regionh.dk and reiterated that the hospital infrastructure was functional at its normal capacity despite their website being crashed.