Both the Gregori and the Orlandi cases led to the Grey Wolves , an extremist Turkish group , claiming to be involved in the abductions and demanding the release of Mehmet Ali Ağca , the assassin who shot and wounded Pope John Paul II in Saint Peter 's Square on May 13 , 1981 . According to Mehmet Ali Ağca 's autobiography , the two girls ' disappearances as well as the disappearance of Soviet journalist Oleg G. Bitov from the Venice Film Festival on September 9 that same year are closely linked
shot and wounded Pope John Paul II
Pope John Paul II assassination attempt
Disappearance of Mirella Gregori