ATF and FBI agents check suspect Dzhokhar Tsarnaev for explosives and also give him medical attention after he was apprehended in Watertown, Massachusetts, at the end of a tense day that began with his older brother, Tamerlan, dying in a getaway attempt. Tsarnaev lay hospitalized in serious condition under heavy guard on Saturday as investigators continue piecing together the who and why of the two brothers involved in the deadly Boston Marathon bombings. (AP Photo)