Does the FBI normally notify the potential victim of an assassination plot? I could totally believe it's standard procedure to just try to handle it themselves. If the target panics, the perpetrators might bolt and never get caught, or something like that.
Would it make sense to inform people that they're being targeted for assassination? I mean, a dedicated hostile entity could just wait for the next event unless the authorities can arrest them with solid evidence.
You want to see intel and analysis? The submitted link has a 112 page FBI intelligence report (complete with an FBI customer satisfaction survey on page 6). What more do you want?
Seems like the hysteria and fearmongering (treating OWS as terrorists) was coming from the Bureau.