Concerned locals in Ealing, West London, were convinced they had spotted an alien aircraft after seeing a mysterious red light.
One posted a photo of the light to a community Facebook page, writing: “Hello everyone, does anybody see this red light up in the sky? Anybody know what it is?”
A piercing red light could be seen shining through the foggy night sky – leaving many to speculate.
One person wrote: “It’s the mothership at last. I’ve been waiting for ages. Laters everyone.”
However, the next morning the true cause of the seemingly-bizarre illumination was uncovered.
Once the sun came up and the fog cleared the source of the light was revealed to be a crane.
The resident who posted the original photo was forced to sheepishly admit they had been fooled.
“Haha guys just a crane… just checked it now. But at night I was sh*****g myself,” they posted.
Another wrote: “I had the same feeling and I was freaking out, in the morning light I saw it was a crane!”
“Crane light in the fog,” another posted.
It comes after an ex-nuclear weapons specialist claimed he saw UFOs flying overhead while serving at a top-secret US Air Force base.
Meanwhile a flight attendant claimed to have spotted a V-shaped UFO flying above an Airbus A230 passenger jet while travelling over Georgia.