The Iranian man arrived on a flight from Iran to Arlanda Airport in November last year. He was arrested on the spot and arrested a few days later, on suspicion of violating international law, aggravated crime and murder.
It has now been just over eight months since then, and the man, who was then 58 years old, has celebrated a birthday in Swedish custody.
Iran's black summerThe whole 80's is a dark chapter in Iran's history and the summer of 1988 has been called Iran's black summer.
The Islamic Revolution had barely established itself before Iraq attacked Iran. It would take eight years and hundreds of thousands of lives before the countries finally agreed to dig down the hatchet.
That is when the order for the executions came from Iran's former supreme spiritual leader, and founder of the Islamic Republic, Ayatollah Khomeini.
At least 5,000 people were killed, according to a report by the human rights organization Amnesty International.
Denied the allegationsThis is the first time anyone has been arrested for these mass executions, UN independent investigator Agnes Callamard wrote on Twitter.
The man has denied the accusations and claimed last winter, through his then lawyer, that they had taken the wrong person.
"At present, I can not answer questions or give any comments," writes the man's current lawyer, Daniel Marcus, in a text message to SVT News.
Detention negotiations take place every four weeks. The Public Prosecutor's Office now has until 19 August to bring charges, or alternatively request that the detention be extended.