WASHINGTON - The White House said on Wednesday it was investigating reports that hackers tried to hack into Google email accounts but did not believe US government email accounts were breached in the attack.

Google Inc said on Wednesday unknown hackers tried to hack into the Gmail accounts of hundreds of users.

"We're looking into these reports and are seeking to gather the facts," said White House spokesman Tommy Vietor. "We have no reason to believe that any US government email accounts were accessed."

The Federal Bureau of Investigation said it was aware of Google's announcement and was working with the world's largest Internet company to review the matter.

Google said on its official blog that the hackers recently tried to crack and monitor email accounts by stealing passwords but the company detected and "disrupted" the campaign. It notified the victims and relevant governments, Google added in its blog post.