Twenty-five years ago, thousands upon thousands of Iranian political prisoners were executed  by the Islamic Republic and buried in unmarked mass graves, particularly in Khavaran , south Tehran. Although the killing continued for months in several cities, August 31 is considered the anniversary and is always commemorated by relatives and friends of victims.
This year, for the 25th anniversary, both foreign-based Iranian media and netizens published numerous special features, tweets, posts, films and reports about the unnamed mass grave in Khavaran cemetery. A Facebook page  is also dedicated to the many victims from 1988.
The majority of those executed were serving prison sentences for their political activities after unfair trials in revolutionary courts. But they had never been sentenced to death.
This year, family members were allowed to attend a commemoration in Khavaran for their loved ones.
Shabeke Anarshist (“anarchism network”) shared a painting for Khavaran's victims and writes that Mostafa Pour Mohammadi , the current Minister of Justice, played a key role in ordering the systematic elimination of prisoners.
Several netizens shared a video with a mourning woman in Khavaran from 2010.
Iranians remembered one of darkest days of the Islamic Republic in several countries including Germany where participants say they “do not want this crime to be forgotten”.
On Twitter there were also reactions.
— madyar (@madyar) September 1, 2013 
Security forces did not allow relatives to commemorate the executed.
روزی از روز ها در گلزار خاوران شهریور سال 1385 زیر پایم هزاران جوان در گورهای دسته جمعی بی نام و نشان ، خفته… http://t.co/20ZRWWZfqR 
— Freedom Messenger (@freedommesenger) August 18, 2013 
Beneath our feet thousands of executed young people are buried.