ISS Leak summary:— Chris Bergin - NSF (@NASASpaceflight) September 3, 2018
First thought was MMOD strike.
Then NASA released pics. Lots of people: "Hmmm, doesn't look like MMOD". NASA deleted the photos.
Top Russian news site RIA NOVOSTI reported - via sources but apparently confirmed by Mr. Rogozin - it was a drill hole. pic.twitter.com/520kHK0TMc