The death toll in the suicide blasts in Iran earlier this week has risen to 91, state media reported on Saturday.

An 8-year-old child and a 67-year-old man succumbed to their injuries, state broadcaster Irib reported.

Around 100 injured people are still in hospital, 11 of whom are in a critical condition.

The secret service said it had arrested a total of 11 people in connection with the attack.

On Wednesday, two suicide bombers blew themselves up in the city of Kerman, at a ceremony to mark the fourth anniversary of the death of the powerful Iranian General Qassem Soleimani.

The terrorist militia Islamic State claimed responsibility for the attack.

Islamic State considers the predominantly Shiite majority in Iran to be apostates of Islam.