Couple of things to note from other media reports:
There's a considerable amount of conflicting information on this incident, which is not unusual in the early hours after a story breaks.
ABC News is reporting the following:
An informant told authorities late last week that a plot was in progress to blow up one of the tunnels under Baltimore's harbor, ABC News has learned.
According to the informant, who is in detention overseas, at least six Egyptian terrorists were going to receive bomb materials that would arrive by ship at Baltimore's harbor in a container marked "Cocoa." The informant said the terrorists would then use the material to assemble explosive devices, which would be planted in cars as part of a plot to bomb one or both of the tunnels.
ABC affiliate WJLA-TV in Washington is reporting that several individuals are in custody and are being interviewed by the Maryland/Delaware Joint Terrorism Task Force.
Note that some of the confusion regards the term "Koko" or "cocoa". The Newsday story referenced below refered to the Koko Market in Baltimore. ABC News reports that the word "Koko" is the label on the container. On the other hand, containers shipped from overseas would be labeled with the name of the company receiving the container in most cases; so that's not necessarily a conflict.
Newsday is reporting that one individual is in custody; ABCNews is reporting several are in custody.
One paragraph of the ABC News report stands out:
The Department of Homeland Security, however, has some doubts about the source's credibility.
According to a senior law enforcement official, analysis of the threat concluded that it was not credible based on the clear motive of the detained informant, his "questionable" performance on a polygraph test, and the lack of any corroboration by individuals named and detained in the United States.
I have these questions (for a start):
1. Is this the same source who provided the material regarding the New York City transit plot?
2. If this report came in last week why were the tunnels closed TODAY?
3. Who are the other dudes in custody?
OK got a reasonable answer to one of my questions:
Question 2: If this report came in last week why were the tunnels closed TODAY?
Answer: Apparantly authorities were concerned that word might reach the suspects and they might proceed with the plot once they realized LE was aware of it.
I'm searching like crazy here.
The pic of the KOKO market.
I've seen it before. Recently.
Where did we see it and why?
I wonder if thats why they reopened the tunnel. Because they found it . . .
BAW's theory may be the answer to your question number 2.