A group of drug convicts including foreigners have been given notice of their executions and could be put to death as early as Friday, though authorities remain tight-lipped about specific details.
Attorney-General Muhammad Prasetyo said today that 14 people - including prisoners from Nigeria, Pakistan, India and Zimbabwe - had been put in isolation and would be executed this week.
"They still have the right to see their family. We have also asked what their last requests are," Prasetyo told reporters.
Indonesia - which has some of the toughest anti-drugs laws in the world - executed 14 drug convicts, mostly foreigners, in two batches last year.
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Activists intensified pressure on Indonesia's leader this week, urging him not to proceed with the third round of executions since he took office in October 2014.
"Indonesian President Joko Widodo, popularly known as 'Jokowi', will be putting his government on the wrong side of history if he proceeds with a fresh round of executions," Amnesty International said in a statement.
Human Rights Watch urged Widodo to call off the executions and avoid a "potential diplomatic firestorm", referring to the global criticism Indonesia attracted when it put to death eight drug convicts in April 2015, including two Australians and a Brazilian.
Citizens from Indonesia, Nigeria, India, South Africa, Pakistan and Zimbabwe would be executed in this round, said lawyers from the Jakarta-based Community Legal Aid Institute, who had visited some of the inmates in prison this week.
A letter from Indonesian convict Merri Utami to Widodo asking for clemency was sent on Tuesday. Activists lobbying on behalf of Pakistani prisoner Zulfiqar Ali said they would also consider making a final appeal, despite alleging their 52-year-old client was tortured into confessing.
"We've seen how Indonesia's legal system is full of flaws. Jokowi can actually put a moratorium on executions, he has the right to do so," said Al Araf, the director of Indonesian rights group Imparsial.