Three congressmen who asked Google to clarify why and how it gathers data being broadcast over Wi-Fi networks from its Street View cameras were not pacify by search giant's reply.

Reps. Henry Waxman of California, Ed Markey of Massachusetts and Joe Barton of Texas posted Google's reply to their questions online and said they carry on to be worried about the activity.

"Google at present admit it has been gather people's information for years, thus far maintains they still do not know precisely what they together and who was susceptible. This is intensely worrying for a corporation that bases its business model on gathering customer data," Barton said.

"That crash is even more worrying and ironical in sight of the truth that Google is lobby the government to adjust Internet service suppliers, but not Google."

Google lately reveal that it had been gather information sent over unsecured Wi-Fi networks whereas collecting images with its Street View cars. Google uses such cars to obtain the photograph that create up Street View, a service that overlays pictures on maps.

Google hasn't examine the information it collected from Wi-Fi networks so it doesn't know what data it has, the company said in response to the questions from the congressmen.

"It is possible that the payload data may have incorporated own data if a client at instant of collection transmit such information," Google wrote.