I don't really think this is terrorism, but I do think we should be very cautious when dealing with cruise liners. They would be an ideal target for terrorist dirtbags. Defenseless, isolated and full of people, this sure would seem like a terrorist's dream target.
I highly doubt this is anything terror related though. I have heard some suggest that and a few others who think this might be a test run to gauge our response. But I seriously think that they already know the capabilities of any bio-weapons they may have and if they use them, there won't be any question about what it is.
This isn't terrorism, but it's good to see everyone keeping their guard up. I awake every day hoping for the best and expecting the worst. We never know when and where or how the next one will occur, just that another attack will occur. I don't suggest people panic or see a terrorist behind every tree, but it certainly is healthy to be aware of what's happening around you....condition yellow as the experts call it. But now that I think about, I always have operated in that mode myself anyway.