China's information technology ministry called accusations of government involvement in cyber attacks alleged by Google "groundless" in an interview with state-run media on Sunday.

The search-engine giant has threatened to pull out of China, saying that Chinese hackers have targeted Google and up to 34 other companies.

"Accusation that the Chinese government participated in [any] cyber attack, either in an explicit or inexplicit way, is groundless and aims to denigrate China," the official Xinhua News Agency quoted a spokesman for the Ministry of Industry and Information Technology as saying. "We are firmly opposed to that."

In a speech on Internet freedom and security Thursday in Washington, U.S. Secretary of State Hillary Clinton urged China to investigate such attacks, saying they raised "very serious concerns."