Heavy shelling has hit the rebel-held Ukrainian city of Donetsk, amid a continuing row over a controversial Russian aid convoy.

People poured out of offices in the city centre after an evacuation warning sounded. At least one person has died.

Donetsk has been surrounded for several weeks by Ukrainian forces battling pro-Russian rebels.

The convoy of at least 260 lorries carrying Russian aid has now halted, after moving towards the border.

There is continuing confusion over the final destination. By this afternoon, the lorries had got to within a few miles of the border, where they had parked in a field,