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(Reuters) — German government websites, including Chancellor Angela Merkel's page, were hacked Wednesday in an attack claimed by a group demanding that Berlin end support for the Ukrainian government, shortly before their leaders were to meet.
Authorities took countermeasures but failed to halt the attack, which left the sites periodically inaccessible from 10 a.m. (0900 GMT), her spokesman Steffen Seibert said. Screens gave Internet users error messages instead.
It was believed to be the first successful prolonged attack on the government's websites, which intelligence agency officials say face about 3,000 such hacker assaults daily.
The head of the BfV domestic intelligence agency said recently about five of the daily attacks came from foreign intelligence agencies.
Wednesday's hacking, which also knocked out the foreign ministry's website, came just before a meeting in Berlin between Ukraine's Prime Minister Arseny Yatseniuk and German President Joachim Gauck. Mr. Yatseniuk will meet Ms. Merkel on Thursday.
"Our service provider's data center is under a severe attack that has apparently been caused by a variety of external systems," Mr. Seibert told a news conference when asked if Ukrainian hackers were responsible.
He said he had no other details. Germany has been a firm supporter of Kiev throughout its confrontation with Russia, which Kiev accuses of aiding armed separatists in eastern Ukraine.
In a statement on its website, a group calling itself CyberBerkut claimed responsibility.
"Berkut" is a reference to the riot squads used by the government of Ukraine's former pro-Russian President Viktor Yanukovich, who was ousted during violent protests last February.
"CyberBerkut has blocked German Chancellor and the Bundestag's (lower parliamentary house) websites," it said on www.cyber-berkut.org.
The claim could not be independently verified.
"We appeal (to) all people and (the) government of Germany to stop financial and political support of criminal regime in Kiev, which unleashed a bloody civil war," it said.
The attack comes after U.S. investigators said they believed North Korea had probably hired hackers to help with a massive cyber attack against Sony Pictures Entertainment Inc. North Korea blamed the United States for Internet outages it suffered soon after.
Mr. Seibert said the goal of Wednesday's hackers was evidently to overload servers that administer the government's websites such as www.bundeskanzlerin.de, www.bundesregierung.de and www.cvd.bundesregierung.de.
The websites, which include general information, speeches and podcasts from the chancellor and general government information, are used by journalists and the public.
The European Central Bank on Thursday reported a breach of its public website, saying it learned about the event after getting an anonymous email seeking financial compensation for the stolen data.