The persons involved appeared to have used “auto script” technology
Telecom operator AT&T has reached out to its wireless customers to inform them that the company was recently a target of an "organised" hacking attempt to collect online information.
However, AT&T spokesman Mark Siegel said that no accounts were breached.
It was reported that the persons involved appeared to have used "auto script" technology to identify whether AT&T telephone numbers were linked to online AT&T accounts.
The company is carrying out investigations to determine the source of the attack and also the intent.
Earlier in 2010, hackers managed to breach AT&T website and managed to collect more than 1,00,000 email addresses belonging to Apple iPad 3G users. Two men, who were charged with the attack, revealed that their goal was to expose security flaws.