There are more heartbreaking details being reported from the Boston Marathon Bombing yesterday: Eight-year-old Martin Richards was among the three victims killed in the explosions at the end of the race. At the time of the first blast, he was waiting near the finish line to watch his father complete the race. His mother and 6-year-old sister also suffered serious injuries during the attack. More than 140 people were injured, and authorities believe that bombs were packed with BBs to intentionally inflict more casualties …