Media reports claim that in both incidents the shooters were frustrated as they had lost their jobs in the ongoing economic recession. Both assailants were wearing bullet proof vests which showed that they were prepared to fight the police.
The Pittsburgh gunman is identified as Richard Poplawski was apparently lying in wait for the police after his mother sought help. He killed two police officers at the door and then third who came to help of his colleagues which was followed by a 4-hour standoff. Poplawski is charged with three counts of homicide and aggravated assault.