Muhammad Rum told reporters outside the Nusakambangan prison that authorities have not decided when 10 other prisoners will be executed by firing squad, CNN reported.
Two Nigerians, one Senegalese and one Indonesian were executed. Petitions to review their cases had been denied.
One of the Nigerians was Humphrey Jefferson Ejike, who was unjustly killed, according to his legal team.
"At this stage, we can only say that we are extremely disappointed with the fact that Jeff was executed," said Raynov Tumorang by text message. "The government does not respect the ongoing legal process on Jeff's case.
"There is strong evidence of torture and he was not given a fair trial. Racism towards our client can be seen in the court decision."
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