Today, many Central Asian populations are an amalgamation of various peoples such as Mongols, Turkics, and Iranians. The Mongol invasion of Central Asia in 13th century resulted in the massacre of the population of Iranians and other Indo-European peoples as well as a large degree of intermarriage and assimilation. Genetic studies shows that Central Asian Turkic people and Hazara are a mixture of Northeast Asians and Indo-European people. Caucasian ancestry is prevalent in almost all central Asian Turkic people. Kazakhs, Hazara, Karakalpaks, Crimean Tatars have more European mtdna than European y-dna. Kyrgyz have mostly European y-dna with substantial European mtdna. Other Turkic people like Uyghurs and Uzbeks have mostly European y-dna but also a significantly higher percentage of European mtdna. Turkmen have predominantly European y-dna and mtdna.