Unlike Henneberry , they used a robot to pull back the tarp over the boat . Suspect Dzhokar Tsarnaev hides in a covered boat in a Watertown backyard . Boat owner David Henneberry notices a section of loose tarp . Hide Caption 1 of 10 Photos: Henneberry sees a pool of blood in the boat and calls 911 .
Suspect Dzhokar Tsarnaev hides in a covered boat in a Watertown backyard . Boat owner David Henneberry notices a section of loose tarp . Hide Caption 1 of 10 Photos: Henneberry sees a pool of blood in the boat and calls 911 .