Today 12 people were killed and around 35 wounded when a bomb detonated during a military parade in Mahabad.
No soldiers were killed in this and most of the casualties are said to have been women and children [BBC, 22nd September]
The bomb appears to have been a time bomb and detonated at about 1020 local time (0650 GMT).
The governor of West Azerbaijan province Vahid Jalalzadeh stated the attack was carried out by "counter revolutionaries."
Today is relevant to Iranian history since it marks the 30th anniversary of the beginning of the Iran war with Iraq that started on this day in 1980 when Iraq launched a large scale invasion of Iran, and which ended in a ceasefire in 1988 after a million people died.