"The terrorists who wreaked deadly havoc by bombing the Boston Marathon and then going on a shooting spree in nearby towns did not disclose the reasons behind their actions or claim responsibility for the attack.
But as evidence emerges, more is becoming known about Tamerlan and Dzhokhar Tsarnaev, the brothers suspected of carrying out the attacks. They were reportedly devout Muslims who were born into a family of ethnic Chechens, lived in the Central Asian republic of Kyrgyzstan, and studied in Russia’s North Caucasus, before coming to the United States as children. Over time, the older brother, Tamerlan, became a more radical figure. Whatever his motivation, he was following a similar path to that of some insurgents in the North Caucasus, who once focused on achieving secular independence for their homeland, but went on to become intertwined in international jihadist networks that share a belief that their number one enemy is America," writes Simon Saradzhyan for the Boston Globe.