(QHA) -

Four monitors for the Organization for Security and Cooperation in Europe (OSCE) who were abducted in May by terrorists in eastern Ukraine have been freed.

According to the AFP news agency, the four freed OSCE observers -- from Switzerland, Turkey, Estonia, and Denmark -- appeared tired and tense and they declined to speak to journalists in Donetsk.

Self-proclaimed Prime Minister of so-called “Donetsk People’s Republic” Alexander Borodai said the four OSCE monitors had been held by a rebel leader in the neighboring region of Luhansk.

An OSCE official in Kyiv confirmed the four had been freed, noting they had "been absent for 31 days."

It comes as a weeklong truce that has failed to halt the fighting in eastern Ukraine is due to end later on June 27.