Bone fragments belong to children of last czar

? For nine decades after Bolshevik executioners gunned down Czar Nicholas II and his family, there were no traces of the remains of Crown Prince Alexei, the hemophiliac heir to Russia’s throne.

Some said the delicate 13-year-old had somehow survived and escaped; others believed his bones were lost in Russia’s vastness, buried in secret amid fear and chaos as the country lurched into civil war.

Now an official says DNA tests have solved the mystery by identifying bone shards found in a forest as those of Alexei and his sister, Grand Duchess Maria.