Washington: The US government is analysing Google’s ‘very serious’ allegations of a cyber spying campaign originating in China.

Secretary of State Hillary Clinton said on Thursday that the allegations were very serious.

“We take them seriously. We are looking into them," Clinton told reporters after saying Washington was "very concerned" over Google's announcement.

Meanwhile, China said it was "unacceptable" to blame it for a cyber spying campaign which Google said had targeted the Gmail accounts of senior US officials, 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 cyber attack.

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

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

Clinton said the company had informed the State Department on Wednesday about its claims before disclosing them publicly.

White House spokesman Jay Carney told reporters meanwhile that President Barack Obama is "obviously aware" of the Google allegations and "updated its website regularly.