Google has acknowledged a fleet of cars, equipped with wireless equipment, inadvertently collected emails and passwords of computer users in various countries, and said it was changing its privacy practices.
The company said it wants to delete the data as soon as possible.
Google announced the data collection in May, but said at the time the information it collected was typically limited to "fragments" of data because the cars were always moving.
Since then, regulators in several of the more than 30 countries where the cars operated have inspected the data.
"It's clear from those inspections that while most of the data is fragmentary, in some instances entire emails and URLs were captured, as well as passwords," said Google's vice-president of engineering and research, Alan Eustace, in a post on Google's blog.