Heavy fighting reported in the main rebel-held city of Donetsk.
Three Dutch investigators have examined bodies from the crashed Malaysia Airlines passenger plane, which are being kept on a train in east Ukraine, the BBC informs.
The experts said the train may later leave the rebel-held town of Torez to start identification process.
The US and other nations say there is growing evidence of Russian complicity in the downing of the plane last week. All 298 people on board MH17 died.
Meanwhile, heavy fighting is reported in the main rebel-held city of Donetsk. Reports say clashes – involving heavy weapons – are going near the city’s airport and the railway station. One multi-storey building was seen on fire, and BBC correspondents on the ground spoke of a number of refugees fleeing the city.
In other developments on Monday: Ukrainian officials say 272 bodies have so far been found; Ukrainian PM Arseniy Yatsenyuk proposes that the Netherlands will lead an international investigation; A separate group of 31 international investigators is now in the eastern city of Kharkiv. Russian President Vladimir Putin says it is essential to give international experts complete security so they can conduct an independent investigation
The Dutch experts are the first international investigators to arrive in the region where the Boeing 777 went down on 17 June.
Monitors from the Organisation for Security and Co-operation in Europe (OSCE) have been at the accident site, but their access to the wreckage has been limited by the rebels.
On Monday, the Dutch experts examined some of the 196 bodies kept in refrigerator wagons in Torez, some 15km (9 miles) away from the crash site. A second train arrived there on Sunday to take more bodies on board.