A medical source to al-Sumaria News website that the surgery was successful.
The source said the surgery was performed after the senior cleric suffered a fracture to his left thigh bone.
Earlier on Thursday, the office of the source of emulation said in a statement, “Last night His Eminence Ayatollah Sistani had an incidental strain to his left leg which resulted in a fracture to his thigh bone and he will undergo surgery today.”
The surgery will be performed “under the supervision of an Iraqi medical team,” the statement added.
A hashtag has been launched on Twitter calling for prayers for the speedy recovery of the cleric.