Two sisters who died during a waterfall climb in Vietnam have been named as Beth Anderson, 24, and Isobel Mackensie Squire,19.
In a statement their family said "two bright lights have gone out". Another Brit Christian Sloan, 25, also died.
It has been reported the trio may have been with an unauthorised tour guide when the tragedy happened.
Harness failure could be to blame for the deaths of three British tourists in Vietnam, a family friend of victim Christian Sloan has told ITV News.
Alan McGlashan said he had spoken to his son James, who had been travelling with Mr Sloan since January 4.
He said: "The message I got was there had been a harness failure when they were on the waterfall.
"I wasn't sure if it meant they were zip-wiring or climbing, but at this moment in time that's all I know, that there was a harness failure, and they fell and drowned."
Mr McGlashan said he could not speculate if the victims' harnesses had been linked together.
His son James had been meant to go on the trip but couldn't as he was ill.
An ex-Royal Navy sailor who died whilst climbing waterfalls in Vietnam was one of "life's one offs," his family have said.
The two women and a man were at the popular tourist spot with an unauthorised tour guide.