Iran Focus
Earlier, some 200 security agents had set up barricades at the entrance of the cemetery to block people from entering.
Many people inside the cemetery were carrying flowers to lay at the tombs of those killed by security forces during anti-government protests last year.
At least 30 people were arrested and dozens wounded in clashes between security forces and opposition supporters at the cemetery.
Separately, a small rally took place in Tehran’s Vali Asr Square, but police quickly dispersed the crowd, according to eye witnesses.
Internet lines have been extremely slow in the capital throughout the day.