MH17 plane crash: The intelligence trail examined
21 July 2014 Last updated at 23:01 BST
The UN Security Council has adopted a resolution demanding access to the crash site of a passenger plane downed over a rebel-held area in Ukraine.
Pro-Russian separatists earlier allowed bodies from the Malaysia Airlines crash to be taken to the city of Kharkiv and handed over to international experts.
Western nations say the rebels struck MH17 with a Russian-supplied missile, killing all 298 people on board.
The BBC's Gordon Corera has been examining the latest intelligence findings.