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European security watchdog OSCE said Friday it had lost contact with a second team of monitors in Ukraine, two days after pro-Russia rebels claimed to have kidnapped four observers.

The team was stopped by armed men in the town of Severodonetsk, about 60 miles north of the eastern city of Luhansk, the organization said in a statement.

The team consisted of four international OSCE observers and one Ukrainian language assistant travelling in two vehicles, the statement said.

“The detained team is in addition to one currently missing in the East that was last heard from on the evening of May 26,” the statement added.

The first four missing observers were detained by militants in the Donetsk region, said Vyacheslav Ponomarev, the self-appointed mayor of the separatist stronghold, Slovyansk.

Alastair Jamieson and Emma Ong