Apple and Google have sent a new round of cyber threat notifications to users around the world, the companies said this week, announcing their latest effort to insulate customers against surveillance threats.

Apple and the Alphabet-owned Google are two of several tech companies that regularly issue warnings to users when they determine they may have been targeted by state-backed hackers.

Apple said the warnings were issued on Dec. 2 but gave few further details about the alleged hacking activity and did not address questions about the number of users targeted or say who was thought to be conducting the surveillance. Apple said that “to date we have notified users in over 150 countries in total.”

Apple’s statement follows Google’s Dec. 3 announcement that it was warning all known users t

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