FBI takes lead in Boston marathon twin blast case

The FBI is investigating the two explosions at the Boston Marathon that killed three people and left 144 people injured – 11 of them in critical condition, some having lost limbs. President Barack Obama has directed his administration to provide whatever assistance necessary in the investigation and response. The two explosions happened at around 3 p.m. and went off within seconds of each other. An eyewitness recalled the terror moment.