Flight MH17: 'Justice should be pursued' - OSCE

The rhetoric over the downing of flight MH17 has intensified as the United Nations human rights chief says the crash over eastern Ukraine could constitute a "war crime".

Meanwhile, heavy fighting has prevented an international police force composed of Dutch and Australian officers from reaching the crash site for a second consecutive day.

Daniel Baer, the US Ambassador to the Organisation for Security and Cooperation in Europe, said: "It's an affront to the memory of those who have been lost that Russia continues to send heavy weapons across the border".