Pakistani authorities lauded the alleged arrest of Gadahn, an Oregon native, as the latest in a string of high-profile operations in Pakistan. A joint CIA raid with the Pakistani Inter-Services Intelligence Service in Karachi in February resulted in the capture of Mullah Abdul Ghani Baradar, one of highest-ranking Taliban officials arrested in years.
Following a FBI denial, however, Pakistan said Monday claim of the Gadahn capture was a case of mistaken identity. Islamabad said the man captured in Karachi is Abu Yahya Majadin Adam, whose name closely resembles a Gadahn alias, London's Independent newspaper reports.
The Independent said Adam was an American citizen, however, raising concerns about the presence of foreign militants operating in Pakistan.
The media went into a frenzy following early announcements of the possible capture of Gadahn, who has a $1 million bounty for his arrest. A similar whirl erupted over the alleged death of Pakistani Taliban leader Hakimullah Mehsud.
Mehsud allegedly died from wounds suffered during a U.S. airstrike in January.
Mehsud was last heard from in an audio tape Jan. 16. Alam Tariq, the official spokesman for the Pakistani Taliban, has not issued a formal announcement, leaving the situation speculative.
Notable deaths of 2014 [PHOTOS]