The issue came to light when German authorities asked to audit the
data.

The search giant said the snippets could include parts of an email,
text, photograph, or even the website someone might be viewing.

“We think the Google Wi-Spy effort is one of the biggest wire
tapping scandals in US history,” John Simpson of Consumer Watchdog told
BBC News.

Drive-by spying

The group conducted an experiment to highlight the vulnerability
some users expose themselves to by retracing the same routes, used by
Street View cars, to detect unencrypted or open networks.

This practice is often described as “drive-by spying” and is
favoured by criminals who trawl the streets to find houses or businesses
using unencrypted wifi, so they can steal financial information.

Google has stressed all along that someone would need to be using
the network as their cars passed by and that the in-car wifi equipment
automatically changes channels roughly five times a second.

Consumer Watchdog focused on a number of high profile politicians
whose homes appear on Google’s Street View maps.

It found that Congresswoman Jane Harman, who heads the intelligence
sub committee for the House’s Homeland Security Committee, has an open
home network that could have leaked out vital information that could
have been picked up by Street View vehicles.

Ms Harman’s office has not responded to calls for comment on the
issue. Consumer Watch said it did not collect any information but did
pinpoint where unsecure networks could be found.

“Our purpose was to show that members of Congress are targets just
as much as every other citizen in the land” said Mr Simpson.

‘Concerns’

The experiment found that a further four residences it checked had
vulnerable networks in the vicinity that may belong to members of
Congress.

This included the home of Congressman Henry Waxman, chairman of the
Energy and Commerce Committee, which has jurisdiction over internet
issues.

His office told BBC News that “Chairman Waxman has previously raised
concerns about Google” which were contained in a letter sent to
company chief executive Eric Schmidt in May.

At that time, Mr Waxman said the Committee was “interested in the
nature of this data collection, the underlying technology your fleet of
Street View cars employed, the use of the information collected, and
the impact it could have on consumer privacy”.

The Computer & Communications Industry Association, CCIA, said
the tactics used by Consumer Watchdog left a lot to be desired.

“What Consumer Watchdog did was not a useful contribution to what
could and should be a broader online privacy debate,” said CCIA
president Ed Black.

“They detected unsecured wifi networks that anyone, including
neighbours, can pick up. It proves nothing about what, if anything, a
person or company like Google might have done to intercept and record
data.”

‘Major progress’

Consumer Watchdog wants Congress to hold hearings on the issue and
ensure that Google boss Mr Schmidt be made to testify under oath.

In a statement, Google wrote “as we’ve said before, it was a mistake
for us to include code in our software that collected payload data,
but we believe we did nothing illegal. We’re continuing to work with
the relevant authorities to answer their questions and concerns”.

That includes German authorities who said it was still waiting to
receive a copy of data gathered by the Street View cars.

The office of Johannes Caspar, the head of the Hamburg Data
Protection Authority, told the BBC that a deadline set for earlier this
week was extended at Google’s request because of the recent 4th of July
national holiday.

“We expect some – and hopefully major – progress early next week,”
said spokesman Ulrich Kuhn.