Amazon's cloud computing customers have to decide themselves how best to protect sensitive information online, a senior executive said Tuesday, following accusations by U.S. lawmakers that the web giant has not done enough to secure data on its servers.

Amazon Web Services (AWS), the cloud computing arm of Amazon.com Inc., has come under fire following a series of high-profile data breaches, including one this year involving the personal information of 106 million people stored on its servers by Capital One Financial Corp.

Chief Technology Officer Werner Vogels said AWS provided multiple services to help customers identify if their data was being stored appropriately and flag any possible problems, but the decision about which settings to use lay with those clients.