His worldview: “Islam”

Col. Timothy P. Alben of the Massachusetts State Police said investigators believed that the two men were responsible for the death of a Massachusetts Institute of Technology police officer and the shooting of an officer with the Massachusetts Bay Transportation Authority, the region’s transit authority. “We believe these are the same individuals that were responsible for the bombing on Monday at the Boston Marathon,” he said. 

Officials said that the two men were of Chechen origin. Chechnya, a long-disputed, predominantly Muslim territory in southern Russia sought independence after the collapse of the Soviet Union and then fought two bloody wars with the authorities in Moscow. Russian assaults on Chechnya were brutal and killed tens of thousands of civilians, as terrorist groups from the region staged attacks in central Russia. In recent years, separatist militant groups have gone underground, and surviving leaders have embraced fundamentalist Islam. 

The family lived briefly in Makhachkala, the capital of the Dagestan region, near Chechnya, before moving to the United States, said a school administrator there. Irina V. Bandurina, secretary to the director of School No. 1, said the Tsarnaev family left Dagestan for the United States in 2002 after living there for about a year. She said the family — parents, two boys and two girls — had lived in the Central Asian nation of Kyrgyzstan previously. 

The brothers have substantial presences on social media. On Vkontakte, Russia’s most popular social media platform, the younger brother, Dzhokhar, describes his worldview as “Islam” and, asked to identify “the main thing in life,” answers “career and money.” He lists a series of affinity groups relating to Chechnya, and lists a verse from the Koran, “Do good, because Allah loves those who do good.” 

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