Was an attack last April on an electric power station near San Jose, Calif., the work of vandals or something far more dangerous — domestic terrorism or a trial run by an individual or organization bent on damaging the nation's electric grid?

The Wall Street Journal, picking up from an earlier report by , explores that question Wednesday about what happened at PG&E Corp.'s Metcalf transmission substation — an event that has received relatively little attention until now.

The top of the Journal's story grabs your attention:

"The attack began just before 1 a.m. on April 16 last year, when someone slipped into an underground vault not far from a busy freeway and cut telephone cables.

"Within half an hour, snipers opened fire on a nearby electrical substation. Shooting for 19 minutes, they surgically knocked out 17 giant transformers that funnel power to Silicon Valley. A minute before a police car arrived, the shooters disappeared into the night. npr(blog)