PHOTOS: Boston Marathon explosions

<div class="meta "><span class="caption-text ">Thermal imaging photos were taken by the Mass State Police Air Wing on the Watertown manhunt. 19-year-old Dzhokhar Tsarnaev was taken into custody Friday night after hiding out in a boat.    (Mass. State Police)</span></div>
April 20, 2013 4:05:36 PM PDT