The Organization for Security and Cooperation in Europe (OSCE) has postponed a planned mission to the troubled central Asian republic of Kyrgyzstan, a senior source confirmed to the German Press Agency dpa Wednesday.
The ex-Soviet state erupted into violence in June, with around 2000 people killed in clashes between ethnic Kyrgyz and the minority Uzbek population.
The fighting was particularly violent around the second city of Osh, in the south.
Around 52 OSCE observer staff were due to arrive in the landlocked state in September, ahead of elections due for October.
But according to the source "the mission has unfortunately been politicized", amid stiff resistance from the south of the country.
There have been several large protests in recent weeks against the proposed mission.
A firm date for its eventual arrival has not been disclosed.
The Russian newspaper Kommersant, which originally revealed that the mission may be postponed, reported that any OSCE mission was likely to uncover "a lot of ugly details" about the June riots, whose final death toll has yet to be ascertained.