Residents of Aberdeen, Scotland, were left wondering if they had been visited by aliens after waking up on Monday to find hundreds of mysterious markings on nearby grass land.
The tenants of the tower blocks in the Seaton area were left scratching their heads at the circle imprints on the grass.
Some speculated that the Granite City had been visited by beings from another planet.
However, the council later came forward to say it is behind the circles.
An Aberdeen City Council spokeswoman said: “The marks are not alien crop circles.
They are preparatory work for planting trees as part of the £500,000 Seaton Backies project
“This is rejuvenating a neglected green space for family use.
We are planting dozens of trees as part of the project to create shelter, and the spots where the trees are to be planted need to be free of weeds before then – the trees will be planted from late autumn to April.”