Former Classmates Reflect on Dzokhar Tsarnaev, Boston Marathon Bombing Suspect

One says, "He was such a sweet sort of quiet guy"

Classmates of the younger Boston Marathon bomber were horrified Friday to wake up to the news that their mild-mannered schoolmate had been identified as the culprit behind one of the largest-scale terrorist attacks on American soil in recent history.

Dzokhar Tsarnaev, 19, is, as of this writing, still at large; his older brother Tamerlan was killed in a shootout with police on Thursday night in Watertown, Mass. after the brothers killed an officer on the MIT campus.