Ukraine forces 'repel rebels in Donetsk airport'

All Saturday morning gunfire was heard from the area, controlled by government forces despite rebel victories in the rest of the eastern city.
Correspondents say the fresh violence is a big challenge to a fragile ceasefire agreed on 5 September.
Meanwhile Ukrainian Prime Minister Arseniy Yatsenyuk has accused Russia of wanting to "eliminate" his country.
He said Ukraine was "in a stage of war", with the "key aggressor" being Russia.
Mr Yatsenyuk said the goal of Russian President Vladimir Putin "is to take the entire Ukraine", adding that Nato was the "only vehicle" that could protect his country.
Ukraine and Western countries accuse Russia of intervening on the side of pro-Russian rebels in eastern Ukraine. Russia denies this.
On Saturday, Russia's Foreign Minister Sergei Lavrov described as "nonsense" reports that Russia was intent on creating a buffer zone in eastern Ukraine.
Russia, he said, wanted Ukraine to be a "prosperous, neutral and friendly country".
And he accused the US of "trying to use the crisis in Ukraine to break economic ties between the EU and Russia and force Europe to buy US gas at much higher prices".
Russian convoy The BBC's Paul Adams, in Donetsk, says most of the gunfire around the airport sounded like artillery, but that multiple rocket launchers have also been in use.
On Friday night, he also heard a volley fired from somewhere much closer to the centre of the city.
There are additional reports of plumes of black smoke rising above the airport.
A couple of hundred Ukrainian army troops have been holed up at the airport since June - but our correspondent says that something more concerted now appears to be going on there.
Unknown convoy
Also on Saturday morning, Russian customs officials said that a Russian aid convoy had crossed into eastern Ukraine.
A spokesman for the European security watchdog, the OSCE, told our correspondent that 220 Russian lorries had passed the border overnight and on Saturday morning - the majority of which were not inspected by either Ukraine or international observers.
Kiev and Western officials fear such convoys may contain military equipment to help the rebels, but Russia insists they contain essential humanitarian supplies such as generators, food and drink.