MH17 investigators say they have found parts of a "possible" BUK missile - the surface-to-air weapon developed by Russia.

The Malaysia Airlines flight came down over rebel-held Ukraine in July last year, 298 people on board, including 80 children.

International and Dutch investigators say they have identified debris at the crash site that "possibly" come from the Russian-made missiles.

There are understood to be seven pieces of debris, but investigators have not described the parts or released any images.

Russia has already vetoed a plan to set up a tribunal through the United Nations to prosecute whoever is suspected of downing the plane.

It is widely believed to have been hit by a surface-to-air missile, and Ukraine and the West have suggested that separatists backed by Russia or Russian troops themselves were responsible for shooting down the plane.

But Moscow has repeatedly dismissed the accusations and state media has suggested that Ukrainian jets were to blame.