Uploader comment: The image is that of a 9/11 twin towers new york poster on a wall since approx 2003. In the past 6 months what appears to be dampness has come through the wall and left 2 effects.
On the right is what could be made out is a ploom of smoke/explosion on the north towers as a result of the dampness.
On the left is what appears to be an image of incomplete aircraft (tail/wing and front of plane in view) facing the direction of the south tower.
The poster has not been removed since it was placed on the wall nor has it been doctored.
The location of the poster is Ireland