Three Additional Arrests Made in Boston Marathon Bombing (May 1): Three arrests are made in connection to the Boston Marathon bombing. Dias Kadyrbayev and Azamat Tazhayakov are arrested and charged with concealing evidence during a federal investigation. Robel K. Phillipos is charged with lying to impede the federal investigation. All three are close friends with Dzhokhar Tsarnaev. If Kadyrbayev and Tazhayakov are found guilty they face up to five years in prison. Phillipos faces eight years.