A bomb killed four people in the southern Iraqi city of Basra on Tuesday and a senior official said Islamic State militants were suspected of carrying it out.
This was the first such attack in years in a part of the country that has enjoyed relative stability.
The blast occurred near a major hospital in the predominantly Shi'ite Muslim city. The motorbike was covered with explosives.
There was no immediate claim of responsibility.
"The blast carries fingerprints of Daesh (Islamic State)," Basra Governor Asaad al-Edani told reporters.
Al-Hadath and Al-Arabiya report that the explosion was an attack carried out by an Iranian-made explosive.
The explosion was reportedly an attack targeting an Intelligence officer who was working on “death squad.”
Death squad refers to an assassin group of Iran-backed militia groups that has been reportedly responsible for killing tens of Iraqi activist.
