U2 Fans Receive Mysterious 'Blackout' Letters

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Bono of U2 performs onstage at the Rose Bowl on May 20, 2017 in Pasadena, Calif.

U2 fans opened their mailboxes Monday (Aug. 21) to find an unexpected letter from the band.

The letter, which appears to be a promotional item, seems to tease an upcoming release. The phrase "Blackout ... It's clear who you are will appear ... U2.com" can be read, as well as a line that says "U2 will announce [blank] on [blank]." What, exactly, Bono and Co. will reveal is unclear.

As Pitchfork points out, the text behind the silhouette art on the letter is from William Blake's collection of poems Songs of Innocense and Experience, which inspired the group's album Songs of Innocence.

Take a look at the enigmatic note below, courtesy of fan tweets.