Rebels in Donetsk
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Violence has erupted near Donetsk airport and railway station

21 July 2014 Last updated at 23:37 BST

Concerns over the security of international teams could be increased by the latest fighting in Donetsk.

There has been heavy shelling in the rebel-held city. Violence erupted near the airport and the railway station.

Gabriel Gatehouse reports from Donetsk for Newsnight.