Some fans of U2 were treated with some very strange mail today.

Fans of the band were treated to a letter which contains two silhouetted figures that reveal a message that reads: “Blackout…it’s clear who you are…will appear U2.com.” The last sentence of the letter is blacked out, with “U2 will announce...on...” .

Totally weird and random piece of mail today. Must be from the @u2 fan club. Very cool that they did this! pic.twitter.com/UCnchdwWBP

— Jeff (@duranimalJeff) August 21, 2017

Any other #U2 fans get this letter in their mailbox today? @u2 @atu2 @U2start @u2songs @u2gigs pic.twitter.com/3Gtws7rbmo

— Amiee Stubbs (@AmieeStubbsPix) August 21, 2017

Any other @U2 fans receive this #Blackout letter in the mail? @U2tour @u2songs pic.twitter.com/PRGnGhbs9x

— Christopher (@kc_surfer) August 21, 2017

It seems possible that the band are gearing up to release a new single, presumably called 'Blackout', with an album announcement to follow.