From Columbus News:
WASHINGTON (AP) -- The F-B-I is now quizzing someone who may be responsible for those online threats toward football stadiums.
A law enforcement official says a young adult in Milwaukee is suspected of being behind the claims that dirty bombs would go off during seven N-F-L games this weekend. The source says this person doesn't appear to have any ties to terror groups.
The threats turned up a week ago on the Web, and officials have said they didn't seem credible. There was also no intelligence backing up such claims. Still, the Department of Homeland Security opted to alert the N-F-L and the stadium owners, just to be on the safe side. But the department is urging fans to go ahead and attend the games.
http://wsyx6.com/template/inews_wire/wires.national/35bc59a7-www.wsyx6.com.shtml
Suleyman Isfahan Al-Irani, formerly Harrington Pinkwater Jr., 25, has always been a model citizen and recently returned from abroad where he performs humanitarian work and pursues religious training. /sarcasm_off
There seems to be some conflicting theories.
Yesterday, some were posting that the named targets were all open-air stadiums. However, others have said some of the stadiums are not.
If the delivery system is via truck, it would seem unlikely that covered stadiums would be the targets.
These, of course, are suppositions and mad ravings of armchair experts at this point.