Four OSCE cars torched in separatist east Ukraine

The Organization for Security and Cooperation in Europe (OSCE) cars, which were burnt overnight, are covered with a canvas near its office in Donetsk, Ukraine, August 9, 2015. Twitter feed. REUTERS/Alexander Ermochenko

KIEV (Reuters) - Four armoured vehicles belonging to the OSCE monitoring mission in Ukraine's eastern conflict zone were destroyed overnight, the security watchdog said Sunday, describing the apparent arson attack as an attempt to restrict its work.

The Organisation for Security and Cooperation in Europe monitors the implementation of a much-violated ceasefire deal and has faced increased hostility in separatist territory in recent weeks.