Family of co-accused left in a state of shock
The parents of the Scottish woman arrested alongside Michaella McCollum Connolly have spoken of their "shock".
William and Debra Reid said they believed their daughter Melissa (19) met the Northern Ireland woman in Ibiza where they were both working.
"She met the other girl out in Ibiza. I know that, but I don't know anything else about her," Mrs Reid said.
"As far as we knew, Melissa was in Ibiza. That is where she has been."
Mr Reid (66) said they were unsure what steps to take next.
He said it was too early to say if any of the family would be travelling to South America.
"If it was in Spain it would be easier to jump on a plane out there to be close to her but Peru is a lot farther away," he told the Daily Mail.
"If it had happened here, you could get the right people to her – but it is much more difficult. The legal system over there is quite different.
"It has only been a day and we are still looking over paperwork."
Mr Reid spoke to the newspaper from his family home near Lenzie, East Dunbartonshire.
"We don't know anything, we haven't been told anything.
"We don't have any new information. We are not in a position to elaborate.
"We're in the position where we are just trying to come to terms with it."
According to her profile on social networking site Facebook, Ms Reid (below) is a former pupil of Lenzie Academy.
She worked as a sales adviser at Scottish and Southern Energy in Glasgow between June 2010 and July 2011 and had also worked for clothes store Next.
Ms Reid flew to Ibiza in June and lists the island as her current location.
She had posted numerous pictures of herself with friends on the island. Her last post was July 21.
The young woman was with Ms McCollum Connolly when they left Ibiza and flew to Lima, Peru, via Madrid.
They were attempting to fly from Peru back to Spain when they were stopped from boarding and were arrested on suspicion of trying to smuggle cocaine.