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An elderly woman walks with young girls past cars burned after shelling near a church in the southeastern Ukrainian city of Mariupol, Donetsk region, on February 25, 2015. Despite the nominal truce in force, the key industrial hub has become the latest hotspot in the conflict in east Ukraine, stoking fears that pro-Russian rebel forces could be gearing up to try to seize the city. AFP PHOTO / GENYA SAVILOVGENYA SAVILOV/AFP/Getty Images
An elderly woman walks with young girls past cars burned after shelling near a church in the southeastern Ukrainian city of Mariupol, Donetsk region, on February 25, 2015. Despite the nominal truce in force, the key industrial hub has become the latest hotspot in the conflict in east Ukraine, stoking fears that pro-Russian rebel forces could be gearing up to try to seize the city. AFP PHOTO / GENYA SAVILOVGENYA SAVILOV/AFP/Getty Images

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    Is Mariupol next target for separatists?

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Is Mariupol next target for separatists?

Ukraine concerned rebels could be eying the vital city of Mariupol, as CNN's Diana Magnay reports.

Is Mariupol next target for separatists?

Ukraine concerned rebels could be eying the vital city of Mariupol, as CNN's Diana Magnay reports.