Dhaka, Aug. 30 -- Security researchers at Google have found evidence of a "sustained effort" to hack iPhones over a period of at least two years.

The attack was said to be carried out using websites which would discreetly implant malicious software to gather contacts, images and other data, reports BBC.

Google's analysis suggested the booby-trapped websites were said to have been visited thousands of times per week.

Apple did not respond to the BBC's request for comment.

The attack was shared in great detail in a series of technical posts written by British cybersecurity expert Ian Beer, a member of Project Zero, Google's taskforce for finding new security vulnerabilities, known as zero days.

"There was no target discrimination," Mr ...