Johannesburg, Oct 22 : Apple has reportedly issued a security warning for iCloud users amid reports of attacks by hackers on the online network.

The company acknowledged the attempted breach, saying that it was aware of "intermittent organized network attack" on its iCloud service.

According to News. com. au, the security warning follows a blog report by Greatfire. org, which monitors Chinese internet censorship, that says Beijing-backed hackers have been using "man-in-the-middle" attacks that dupe people into giving away their usernames and password and giving unauthorised access to their documents, photos and emails.

Apple said in its security warning that the attack did not compromise iCloud servers, adding that it was deeply committed to protecting its customers' privacy and security.

The security warning further asked users to pay attention to any invalid certificate warning in their browser while visiting www. icloud. com and not proceed, the report added. (ANI)