 Turkish sources had also stated that the PKK carried out kidnappings of tourists, primarily in Istanbul, but also at different resorts.However, the PKK had in its history arrested 4 tourists and released them all after warning them to not enter the war zone.The vast majority of PKK's actions have taken place mainly in Turkey against the Turkish military, although it has on occasions co-operated with other Kurdish nationalist paramilitary groups in neighboring states, such as Iraq and Iran.