BOSTON (Reuters) - A grand jury on Thursday indicted two students from Kazakhstan on obstruction of justice charges, alleging they helped hide evidence related to the April Boston marathon bombing that killed three and injured 264, the U.S. Attorney's office for Massachusetts said. Dias Kadyrbayev and Azamat Tazhayakov, both 19, were college friends of surviving bombing suspect Dzhokhar Tsarnaev. They are charged with removing a backpack containing fireworks and a laptop from Tsarnaev's dorm room after the FBI released pictures of Dzhokhar and his older brother Tamerlan in an effort to learn the names of the bombers.