DNA tests on 2,000-year old skulls, which it has been suggested could come from aliens, have raised more questions than answers.

The skulls, found in Peru, created a media sensation in 2014 after a geneticist undertook preliminary DNA tests, and reported unknown results.

The geneticist found that they had mitochondrial DNA “with mutations unknown in any human, primate, or animal known”.

A second round of DNA testing has now been undertaken – leading to further speculation that the skull’s former owners may not have been from this planet.

The elongated skulls were caused by ancient civilisations purposefully mutilating their skulls from a young age by binding the head between two pieces of wood, or binding in cloth.

The new tests on the skulls have, however, not aided the alien theory, but have raised new questions about how the Americas were populated.

Samples were taken from hair and bone powder, taken drilling deep into a skull’s foramen magnum.

The samples were then sent to three labs in Canada, and two in the US, for DNA testing.

The geneticists at those laboratories were told that the samples were from an ancient mummy, to avoid any preconceptions.

The skulls were now found to have European and Middle Eastern Origin, raising questions over when man first travelled from Eurasia to the Americas, as they are 2,000 to 3,000 years old.

Around 300 skulls were found by Peruvian archaeologist Julio Tello in 1928 in an elaborate graveyard.

But there still remains a mystery over the shape of the Paracas skulls where cranial deformation changed the shape of a skull, but in normal cases did not alter its other features, however, the Paracas skulls have other unusual features and are the biggest elongated skulls ever found.

Author LA Marzulli told Ancient Origins: “There is a possibility that it might have been cradle headboarded, but the reason why I don’t think so is because the position of the foramen magnum is back towards the rear of the skull.

“A normal foramen magnum would be closer to the jaw line.”

He added: “The archaeologist states that the Paracas skulls, the position of the foramen magnum is completely different than a normal human being, it is also smaller, which lends itself to our theory that this is not cradle headboarding, this is genetic.”

Mr Marzulli claimed some of the Paracas skulls also have very pronounced cheek bones, different eye sockets and no connective tissue joint between the two parietal bones of the skull.

There is a disease known as craniosynostosis, which results in the fusing together of the two parietal plates, however, Mr Marzulli said there is no evidence of this disease in the Paracas skulls.