A top Google executive said Tuesday that the Internet giant has set no timetable for its operations in China but remains firm in its plan to end censorship of Web search results there.

"We are reviewing our business operations (in China) now," Google vice president and deputy general counsel Nicole Wong told a congressional hearing on "Global Internet Freedom and the Rule of Law."

Asked by the panel chairman, Senator Dick Durbin, whether Google has a timetable for ending the censorship of its Web search engine in China, Wong said: "We don't have a specific timetable."

"Having said that, we are firm in our decision that we will not censor our search results in China and we are working towards that end," she said.

Wong said Google has "many employees on the ground" in China "so we recognize both the seriousness and the sensitivity of the decision we are making.

"We want to get to that end -- of stopping censoring our search results -- in a way that is appropriate and responsible," Wong said. "We are working on that as hard as we can but it's a very human issue for us."

Wong gave few new details on the mid-December cyberattack on Google originating from China that was partly responsible for the California company's decision to no longer censor its Chinese search engine, Google.cn.

In her prepared remarks to the Senate Judiciary Committee's Subcommittee on Human Rights, Wong also said that more than 25 governments have blocked Google services over the past few years.

Wong said YouTube has been blocked at least 13 countries since 2007: China, Thailand, Turkey, Pakistan, Morocco, Brazil, Syria, Indonesia, Iran, Saudi Arabia, Myanmar, Bangladesh and Turkmenistan.

She said Google blogging platforms Blogger and BlogSpot had been blocked in at least seven countries in the last two years: China, Spain, India, Pakistan, Iran, Myanmar and Ethiopia.

And the social networking site Orkut has been blocked recently in Saudi Arabia, Iran and the United Arab Emirates, she said.