[Condor51]

"Spokane Police say a witness saw somebody run up to the house and then run away. A few seconds later the house was rocked by the explosion

This is how Outlaw Bikers *used to* solve their 'differences'.
Don't know the demographics of this particular area, just saying.

[Cindy]

I believe biker gangs and gangs in general still use those tactics — unknown at this time what the situation is regarding this incident.