The dark UFO was recorded by Webcams de Mexico, a network of cameras locked on active volcanoes in the central American country to watch out for eruptions, as it appeared to pass over the Colima Volcano on June 13.
But despite all the fuss one UFO sceptic has already debunked the sighting saying it is just a blurred bird in flight known as a blurbo.
A report on paranormal website Inexplicata.blogspot.co.uk said the network of webcams had now acquired a worldwide reputation for capturing unusual phenomena such as this over Colima and the Popocatepetl Volcano.
It said: “A new UFO photo has gone viral on social media, shown near the Volcan de Fuego in the state of Colima.
“Through its Facebook account, Webcams de Mexico displayed the photograph last Friday, showing an object crossing the sky near the fiery colossus.
“The photo asks the question ‘what could it be?’ in order that users may leave their comments about what appears to be a flying saucers.”
Scott C Waring, editor of UFO Sightings Daily, has also posted the pictures.
He blogged: “This is a really cool sighting from Mexico.
“I actually saw something like this yesterday on the Colima cam, but didn’t report it because it wasn’t clear enough, but this one is fantastic.
“Here you can make out dark disk with a thick centre area and a round window or doorway on the edge. Wow, just mind-blowing.”
Blurbos are often confused as UFOs, according to Scott Brando, of UFOofinterest.org, a website which forensically examines alleged UFO sightings.
Mr Brando tweeted in response to the webcams Facebook posting a picture of several birds in flight with the headline “Choose Your ‘UFO'”.
Looks like the alien chasers have have to keep hunting.
