Yamal peninsula burials

Unique crouched burials for this period - comprising seriously ill quartet - presents archeologists with a puzzle.

Young boy was laid to rest all alone with two iron knives, his feet trampling on reindeer bones, wearing elaborate headdress decorated with iron rings.

At least 6 are believed to have the virulent intestinal form of the disease from which one boy has already died.

Russian army biological protection troops called in amid warnings 'utmost care' needed to stop deadly infection spreading.

This summer's melting of permafrost is more than THREE TIMES greater than usual, unlocking long-frozen deadly diseases.

Boy killed 'after lethal infection 'awoke' in human graveyard due to unprecedented heat wave'.

Four children among those in intensive care, as locals undergo mass evacuation and quarantining, while reindeer herd decimated.

Academics restart work to unlock secrets of mystery medieval civilization with links to Persia on edge of the Siberian Arctic.

In each case the deadly decades-old 'zombie' disease originated in contaminated soil and was awakened by hot Arctic summer weather.