The ex-boyfriend of a British backpacker killed in Thailand believes police have "pinned" the murder on two men, according to a friend.
Hannah Witheridge and David Miller (pictured) were killed last month while on holiday on the Thai island of Koh Tao.
Two Burmese men - bar workers Zaw Lin and Win Zaw Htun, both 21 - have reportedly appeared in court accused of the killings.
But concerns have been raised that the two men are innocent "scapegoats", and a petition signed by more than 100,000 people was handed into 10 Downing Street today demanding a new, independent investigation into the deaths.
Alexandra Boyles (28) said Miss Witheridge had split with her boyfriend just four months before going travelling and he had been left "heartbroken" at her death.
Ms Boyles declined to name Miss Witheridge's ex-boyfriend but said he had criticised the police probe into her death on Facebook.
Speaking at a demonstration in Whitehall as the petition was handed in, she said: "I never met her but I know her ex-boyfriend - it is just too close to home. It is really, really shocking. Just horrific.
"I have spoken to her ex-boyfriend and he is absolutely distraught," she added.
"It was Hannah's birthday a couple of days ago and he was absolutely heartbroken.
"He thinks it is a corrupt case and they have pinned the blame on these two men."