Police in South Korea said they had raided Google's Korea head office in Seoul on Tuesday on suspicion that the subsidiary of the search engine company had illegally collected location data from application subscribers.

Google's AdMob business could not deliver advertising through iAd if Apple began enforcing a policy that restricts the involvement of companies that have their own mobile operating systems, said Omar Hamoui, vice president of mobile ads at Google.

U.S. regulators are planning to investigate whether Apple is shutting out third parties such as Google and Microsoft in advertising the iPhone and iPad, according to a report published by the Financial Times on Thursday.

Google today attacked Apple's apparent decision to ban some third-party ad networks from collecting ad performance data on the iPhone and iPad.

After intense scrutiny to ensure the acquisition won't make Google a de facto monopoly in mobile advertising, Google's purchase of AdMob got the regulatory green light and was finalized this past week. The upcoming launch of Apple iAds played a fundamental role in helping Google clear the antitrust hurdle, and now the two platforms will go head to head for the nascent mobile ad market.

Google has closed its acquisition of AdMob, following news less than a week ago that the U.S. Federal Trade Commission would not block the deal.

The U.S. Federal Trade Commission won't block Google's US$750 million acquisition of mobile advertising vendor AdMob because the deal isn't likely to harm competition in the emerging mobile advertising market, the agency said Friday.

Apple has acquired Quattro Wireless, according to an item posted Tuesday on the mobile advertising company's blog.