Hackers were able to remotely install surveillance software on phones and other devices using a major vulnerability in messaging app WhatsApp, ONA reports citing BBC that WhatsApp confirms it.
WhatsApp, which is owned by Facebook, said the attack targeted a "select number" of users, and was orchestrated by "an advanced cyber actor".
A fix was rolled out on Friday.
The attack was developed by Israeli security firm NSO Group, according to a report in the Financial Times.
On Monday WhatsApp urged all of its 1.5bn users to update their apps as an added precaution.
The attack was first discovered earlier this month.