There was an inscription on the windshield

"On April 6 at 20:08hrs the OT [Observer Team] observed a van registered in Ukraine which arrived at the BCP [Border Crossing Points] from Ukraine and crossed into the Russian Federation. There was an inscription on the windshield "Ritual Service" and "Gruz 200" ("Cargo 200," which is a well-known Russian military code used for "military personnel killed in action") in Russian language," the OSCE said in its weekly update based on information as of April 12, 2016.

The observers could not ascertain whether it was carrying a coffin, the update said.

Read alsoFour of eight wounded Ukrainian soldiers in critical condition– doctorDuring the reporting period, the OTs at the Donetsk BCP observed ambulances on four occasions. All four ambulances were registered in Ukraine and were seen crossing the border in both directions. Besides the medical crew, the OTs did not observe any other persons on board these ambulances.

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Gukovo and Russian-based Donetsk are close to the border points of Chervonopartyzansk and Izvaryne, which are located in temporarily occupied territory in Donbas, eastern Ukraine.