It may have something to do with the FDA halting a pip "product" and the news that an oral argument date has been set for the appeal with judges en banc. They are not taking this precedent upsetting decision lightly!!!
According to the company IR, PIP is required to submit "additional" data to FDA. Wish PIP would send out a statement instead of saying nothing:
08/10/2012 (MidnightTrader) -- PharmAthene (PIP:$1.0799,$-0.0401,-3.58%) says it received notification from the U.S. Food and Drug Administration that its SparVax rPA anthrax vaccine program has been placed on clinical hold. It says the FDA will provide details of the basis for the clinical hold within 30 days.