You can see another part of the testimonies of eyewitnesses of the 1988 massacre in Iran in the following clip.

This part is dedicated to the testimony of Mr. Massoud Abouie-Rad.

My name is Massoud Abouie-Rad. I am a former political prisoner who spent eight years in Evin, Gohardasht, Ghezelhesar, Babol, Sari, and the joint committee prisons.
My older brother, Mehdi, a political prisoner under Shah’s regime, was executed on August 9, 1981, by the criminal clerical regime.
The clerical regime has also executed two of my sisters.
Concerning the 1988 massacre, we were transferred to solitary confinement on July 19, 1988, and it was clear that something is coming up.
I was with Reza Shemirani and Amir Abdollahi in a cell. On July 28, 1988, Amir was summoned. When he returned at 11 PM, he told us that they took us to court, we were 78 people, and they sentenced all of us to executions. They want to execute all.
He whispered these words in my ear when they allowed him to come back to the cell and collect his belongings.

Read more testimonies, the below link: