Unfortunately, according to another article, this policy did cover "political violence".
Still its a general principal that insurance doesn't cover your own deliberate acts, and It's certainly arguable that the damage was a foreseeable result of their own action.
If I were the insurance company, I'd deny the claim and litigate it out . . . unless they could get jurisdiction and venue in the PA . . . talk about getting "home cooked" . . . they might really GET cooked (i.e. blown up).