The osce monitors asked if there was any chance they could speak with some expert in charge for the actions conducted on the site.
An osce official contacted by phone told The Daily Beast that he was unable to confirm any details about the clash.
Another group of osce observers disappeared in Eastern Ukraine on the evening of May 26.
A local man named Alexander, interviewed by the osce, said he did not know whose missile shot down the Boeing 777.
The osce could not tell who fired at the school, Ukrainian or rebel forces.
But he conceded that whatever the truth of the matter, the incident would make the osce task much harder.
And the osce was given a lead role in implementing the accord.
But from the moment the osce team arrived at the site, it began to look doubtful the inquiry had any chance to succeed.
Under the accord, the osce is tasked with overseeing the disarmament of militants and their evacuation from occupied buildings.