Photo of the week: Black Hawk over Boston

The week began with two bombs exploding at the Boston Marathon finish line on Monday. On Friday, nearly the entire city was in lockdown as U.S. military helped in a massive manhunt for Dzhokhar A. Tsarnaev. The 19-year-old was on the run after escaping a shootout with police during which his brother, Tamerlan, 26, was killed while reportedly wearing explosives. The duo allegedly killed an MIT police officer, held up a 7-11, and then carjacked a Mercedes-Benz before police caught up to them.

Photo by Mario Tama/Getty Images