Secretary of State Hillary Clinton said Thursday that the US government is looking into Google's "very serious" allegations of a cyber spying campaign originating in China.

It was serious enough for US President Barack Obama to be kept informed as the White House said "threats to information and communications infrastructure pose a serious economic and national security challenge."

But White House also said that it is not aware that any official email accounts had been compromised.

Clinton said Google informed the State Department on Wednesday about its allegations before going public with them.

"These allegations are very serious. We take them seriously. We are looking into them," Clinton told reporters.

China said Thursday it was "unacceptable" to blame it for a cyberspying campaign which Google said had targeted the Gmail accounts of senior US officials, military personnel, journalists and Chinese activists.

The comments marked the latest salvo in a battle between the Chinese government and Google dating back to last year when the US Internet giant revealed it had been the victim of a separate China-based cyberattack.

Google said Wednesday it was hit by a cyberspying campaign that appeared to have originated in Jinan, capital of the eastern Chinese province of Shandong.

The company did not specifically point the finger of blame at Chinese authorities.

White House spokesman Jay Carney told reporters meanwhile that Obama is "obviously aware" of the Google allegations and "updated on these sorts of things regularly.

"Threats to information and communications infrastructure pose a serious economic and national security challenge for the United States and our partners, which is why the president has made cybersecurity one of his top priorities," Carney said.

Clinton underlined the point by saying the State Department named Chris Painter as its first-ever cyber security coordinator "because we know this is going to be a continuing problem.

"And therefore we want to be as prepared as possible to deal with these matters when they do come to our attention," she said.

Carney said that, "as with all intrusions, we employ an all-of-government approach with the appropriate agency in the lead. In this case, the FBI is coordinating a response."

Though the government is still studying the reports, Carney said "we have no reason to believe, at this point, that any official US government email accounts were accessed."

State Department deputy spokesman Mark Toner said meanwhile he was not aware that anyone at the State Department had been affected by the hacking.

Google noted in its warning that personal Gmail accounts were targeted.

Personal email accounts usually lack protections against "spoofing and malware" used in business email systems, according to a Contagio security advisory that accompanied Grosse's blog post.

Toner said there was no prohibition on State Department officials using private e-mail services such as Gmail for their personal email while they are at work.

"That said, we all undergo, I think, annual cyber-awareness security reviews, programs," Toner said.

"And I think it's important to say that in that training it's stressed that there's no assumption of confidentiality in any kind of personal e-mail account and that you should obviously act accordingly," he said.

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