Fawaz Gerges, Director of the Middle East Center at the London School of Economics, has told ITV Daybreak that "it would take a spark to ignite the conflict in Syria."
He added: "The conflict in Syria has mutated and taken a very dangerous turn. It has major implications for regional stability and international peace and security."
More top news
World Rugby chairman Bernard Lapasset led the tributes, calling Lomu 'a giant' of the game.
Jaw bone fragment studied by British scientist comes from a smaller cousin of the better known Triceratops.
Health committee report recommends steps to tackle obesity, including restrictions on advertising and the introduction of a 'sugar tax'.