"Apple does not attribute the threat notifications to any specific state-sponsored attacker," the firm said.

State-sponsored attackers, it said, are "very well-funded and sophisticated, and their attacks evolve over time".

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"Detecting such attacks relies on threat intelligence signals that are often imperfect and incomplete. It's possible that some Apple threat notifications may be false alarms, or that some attacks are not detected," it said.

It, however, refused to say what triggered warnings received by MPs, such as Mahua Moitra of TMC, reported PTI.

"We are unable to provide information about what causes us to issue threat notifications, as that may help state-sponsored attackers adapt their behaviour to evade detection in the future," Apple said.

Meanwhile, sources privy to the development told PTI that Apple has sent threat notifications to individuals whose accounts are in nearly 150 countries.

Several opposition leaders on Tuesday claimed they had received an alert from Apple warning them of "state-sponsored attackers trying to remotely compromise" their iPhones and posted purported screenshots of the message on their X handles.

Shiv Sena (UBT) MP Priyanka Chaturvedi, Trinamool Congress' Mahua Moitra, Aam Aadmi Party's Raghav Chadha, Congress' Shashi Tharoor and his party's media and publicity department head Pawan Khera shared the message from Apple on X. CPI(M)general secretary Sitaram Yechury also received a similar message, sources in the party told PTI.

"Received text and email from Apple warning me that the government trying to hack into my phone and email. @HMOIndia -- get a life. Adani and PMO bullies - your fear makes me pity you," Moitra said sharing the screenshots.

The message shared by the MPs stated, "ALERT: State-sponsored attackers may be targeting your iPhone".

"Apple believes you are being targeted by state-sponsored attackers who are trying to remotely compromise the iPhone associated with your Apple ID. These attackers are likely targeting you individually because of who you are or what you do. If your device is compromised by a state-sponsored attacker, they may be able to remotely access your sensitive data, communications, or even the camera and microphone. While it's possible this is a false alarm, please take this warning seriously," it stated.

(With inputs from PTI)