The family of Co Tyrone woman Michaella McCollum say they are shocked and distressed following her arrest in Peru on suspicion of drug trafficking.
The 20-year-old from Dungannon, along with a 19-year-old Scottish woman, are due in court tomorrow.
In a statement issued this evening, Ms McCollum's family said they are confident she will be cleared of any wrongdoing.
The family said they fully supported Michaela and that they were making arrangements to travel to Peru.
Peter Madden, of Madden & Finucane, who is representing the family, said they are "obviously shocked and distressed by the recent events but are confident that Michaela will be exonerated".
Support groups in Lima have been contacted to ensure that Ms McCollum's current needs are met, he added.
Mr Madden said he was arranging legal representation for her in Lima.
He said: "I spoke to Michaella last night and she emphasised that she denied that she was guilty of any offence.
"She is well. She is not on hunger strike. She is finding it difficult to cope with the current situation, so far from home, but is optimistic."
Video footage of arrest emerges
Authorities in Peru earlier released a video of Ms McCollum and Melissa Reid, from Scotland, who were arrested at Lima's international airport last week.
The National Police of Peru said it found more than 10.8kg of cocaine, thought to be worth around €1.7m, hidden in food in the luggage of the two women.
The video shows the two women being questioned by authorities.
Both Ms McCollum and Ms Reid answered a number of questions.
Ms McCollum confirmed her name and that she was Irish.
Her family had reported her missing prior to news of her arrest as she had not been in contact with them for a number of days.
She was living in Ibiza, having moved there from Belfast.
Ms Reid, from Lenzie in East Dunbartonshire, said: "I was forced to take these bags in my luggage."
When asked if she knew they contained drugs, Ms Reid said: "I did not know that."
Ms Reid also confirmed that they were due to fly on an Air Europa flight to Madrid, and then on to Majorca.
Amnesty International has raised concerns about prison conditions in Peru following the arrests.
The Director of Amnesty International in Ireland Colm O'Gorman described conditions in Peruvian prisons as "poor".
Former Irish Honorary Consul to Peru Michael Russell said he is being kept up-to-date on the women's conditions and hopes to visit them later tonight.
Meanwhile, an Irish-American bishop who met Ms McCollum and her co-accused at the prison said the women were being treated well.
However, Archbishop Sean Walsh of the Pentecostal Eastern Catholic Church said the women's chief concerns were for their families because they may be facing long prison sentences.
The Department of Foreign Affairs this afternoon said embassy officials based in Mexico have been in direct contact with Ms McCollum.
A spokesperson said officials are continuing to provide consular assistance to her family in Co Tyrone.
The spokesperson added that Irish embassy officials in Mexico are working with their British counterparts in Lima.