(Woonsocket, RI) -- A Bellingham science teacher's son is defending her after a search warrant was executed at their home. Michael McNamara said federal agencies came searching for clues in connection with an investigation into an explosion that damaged the Jeep of a high school principal. McNamara says on Tuesday morning, around 20-to-26 officers came in, occupying all nearby parking spaces. Police believe the principal was targeted and it was a pipe bomb that went off.