https://www.reuters.com/article/us-facebook-security-exclusive/u-s-u-k-urge-facebook-not-to-encrypt-messages-as-they-fight-child-abuse-terrorism-idUSKBN1WI22L

(This Octoebr 3 story has been refilled to correct headline and grafs 1-4 to show agreement involves only the U.S. and the U.K., not Australia. Australia signed a separate open letter to Facebook)