The FBI is investigating what they call a "Military Style" attack on a San-Jose-area power plant earlier this year.

Early morning, April 16th, one or possibly two gunmen broke into the PG&E substation in Metcalf, cut cables, knocking out land-line and cell phone service in the area, and then fired more than 100 rounds from a high-powered rifle at more than a dozen transformers.

While there was no long-term damage, the real question is who is responsible, or if there are any future attacks planned. 

The FBI's San Francisco office has confirmed to that they are investigating but stated there is no evidence the attack is related to terrorism.