[However,
a law enforcement official cautioned that the presence of the bug there does not necessarily mean that the mayor, himself, is under investigation....Williams said it was unclear if the surveillance was directly related to two ongoing federal investigations in Philadelphia....
One current investigation involves a no-bid, $1 million-a-year airport-services contract between the Street administration and a company owned by the mayor's brother, Milton Street.]
Hmmmmmm. This warrants further investigation. 
We need a full investigation on who "leaked" the placement of a legal federal wiretap in a major investigation of government corruption.
Obstruction of justice at bare minimum...