At least 21 people died when a bus fell off a bridge in the southern Iranian province of Fars, IRNA and "Agence France-Presse" reported, quoted by NOVA.
Masoud Abed, head of the province's emergency services, said that 29 people were injured in the incident.
The accident occurred at around 11:05 a.m. local time in the southern city of Shiraz.
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A high alert has been declared in several hospitals in the city. The Crisis Operations Command and the Medical Monitoring Center are coordinating their efforts to provide assistance to the victims.