A quick look at the MSNBC story shows that the ship is a container ship. Thus a bomb could very easily have been in one of the containers, and the crew wouldn't have a clue.
Glad I don't live near a harbor, but then again the container could just as well have been loaded onto a truck bound for Denver, about as far from the Ocean as you can get.
I kind of forget, how did the middle eastern terrorists in Clancy's fictional "Sum of All Fears" get their device to into the country and to Denver? My copy is in a storage place in San Antonio, and I'm in Oklahoma City, so I can't just pull it off the shelf and check for myself.
In a container, on a ship, then trucked to Colorado...