Indonesian President Joko Widodo has repeatedly insisted that drug traffickers must face the firing squad to stem rising narcotics use. There are scores of drug convicts on death row in the country, including Indonesians and foreigners.

“We have been making preparations,” Darmanto said. “We are ready whenever the order comes.”

There has been growing speculation in recent weeks that executions were set to resume after a year-long hiatus, but high-ranking officials in Jakarta have so far said little. There was no immediate comment on Wednesday from the attorney-general’s office.

The execution in April last year of seven foreigners – two Australians, a Brazilian and four Nigerians – and an Indonesian for drug offences sparked international fury.

Since then, no one else has been put to death, but officials had continued to insist publicly that it was the country’s right to use capital punishment.

Among the foreigners on death row are Frenchman Serge Atlaoui and Filipina Mary Jane Veloso, who were both pulled from the last round of executions.

A British grandmother, Lindsay Sandiford, is on death row in Bali after she was caught smuggling a huge stash of cocaine into the resort island.

Darmanto said preparations included ensuring locations where the executions would take place were ready. For last year’s executions, the drug convicts were taken to a jungle clearing on the island, which houses several high-security prisons, and tied to stakes before being shot.

“We have also prepared the facility for the bodies,” he said.

“Each death row convict will face a group of 10 shooters and one group commander. We have selected and trained the personnel.”

The executions last year of Australian drug smugglers Andrew Chan and Myuran Sukumaran in particular caused tensions, with Indonesia’s neighbour Australia temporarily recalling its ambassador from Jakarta.

The April round was the second under Widodo. Since he took office in 2014, 14 drug convicts – mostly foreigners – have been executed.