Google confirmed on Tuesday that the U.S. Federal Trade Commission is investigating its proposed $3.1 billion purchase of online advertising seller DoubleClick

Google is confident the FTC will conclude the acquisition "poses no risk to competition," Google said in the statement.

[ Talkback: Google-DoubleClick a dangerous monopoly? ]

Several independent analysts have determined that "the online advertising industry is a dynamic and evolving space ... and that rich competition in this industry will bring more relevant ads to consumers and more choices for advertisers and Web site publishers," the company said.

The company pointed to other companies' recent acquisitions in the online advertising market as evidence of competition there.

Since Google announced the DoubleClick deal, Yahoo has announced plans to acquire online advertising firm Right Media for $680 million. Earlier this month, AOL announced plans to acquire ADTECH, an international online ad-serving company, and WPP Group announced plans to acquire online advertising firm 24/7 Real Media for $649 million.

On May 18, Microsoft said it planned to acquire of aQuantive, an online advertising and marketing firm, for $6 billion.

An FTC spokesman declined to comment on the investigation, instead referring to the Google statement. The FTC will have no more immediate comments on the investigation, the spokesman said.

Google announced the deal last month. Microsoft had also pursued DoubleClick, which places online advertising for more than 1,500 clients.

On April 20, the Electronic Privacy Information Center, the Center for Digital Democracy, and the U.S. Public Interest Research Group, filed a complaint with the FTC, asking the agency to block the merger unless it obtained guarantees from Google and DoubleClick that they will protect Internet users' privacy.

The groups want a guarantee that Google will destroy all cookies and other persistent identifiers resulting from Internet searches that could be personally identifiable.

This story was updated on May 29, 2007