At least nine people have been killed and more than 100 wounded in an explosion at a mosque in Iran, local media reports say.
Ten people have been killed and 160 wounded in an explosion at a mosque in southern Iran, local media reports say.
The blast reportedly occurred during an address by a prominent local cleric in the southern city of Shiraz.
Authorities in the city of Shiraz were investigating the blast, which some early reports had blamed on a bomb.
The city's Law Enforcement Force commander, Col Zamani, told the semi-official Fars news agency that the explosion had been caused by a bomb.
But a local police chief told Fars news agency that he had ruled out sabotage, and that "negligence" involving old war munitions might be the cause.
There has been no immediate claim of responsibility for the blast.
The explosion occurred at around 2100 (1630 GMT) on Saturday and was heard a mile (1.5km) away, the agency reported.
Fars quoted a hospital official as saying at least nine people had been killed and 105 injured. An initial Iranian TV report said scores had been killed, but later revised its death toll to "several".
"The incident could have happened as a result of negligence. A while ago at this site there was an exhibition commemorating the [1980-1988] Iran-Iraq war," Commander Ali Moayeri, police chief of Fars province, told Fars news agency.
"The munitions left at the site could have the been the reason for this explosion," he added. The agency said he ruled out any act of sabotage.
Weekly meeting
Weekly meeting
A police official said a home-made bomb had been planted in the mosque, Fars reported.
Most of those inside the Hoseyniyeh Shohada mosque when the explosion took place were young boys and girls affiliated to the Rahpoyan-e Vesal Association, which "holds weekly meetings every Saturday regarding misguided groups, including Wahhabis and Bahais", Fars said.
The agency said the explosion occurred at around 2100 (1630 GMT) and could be heard a mile (1.5km) away. The Irna news agency said it broke the windows of many nearby houses.
The Irna news agency said the blast broke the windows of many nearby houses.
Most of those inside the Hoseyniyeh Shohada mosque were young boys and girls affiliated to the Rahpoyan-e Vesal Association, which "holds weekly meetings every Saturday regarding misguided groups, including Wahhabis and Bahais", Fars added.
Members of the Law Enforcement Force and the Basij militia placed a cordon around the mosque, while ambulance and fire crews worked to help the victims.
Wahhabism is a strict version of Sunni Islam practised throughout the Arabian Peninsula, most notably by Saudi Arabia's ruling family, while the Bahai faith is viewed as heretical by Iran's religious authorities.
Members of the Law Enforcement Force and the Basij militia have placed a cordon around the mosque. Ambulance and fire crews are said to be at the scene assisting the victims.
Television channels urged people in Shiraz to donate blood for the injured, adding that all nurses in the city had been called in on duty.
Television channels urged people in Shiraz to donate blood for the injured, adding that all nurses in the city had been called in on duty.
Shiraz, about 900km (560 miles) south of the capital Tehran, is a major tourist destination because of its closeness to a number of important ancient sites.
Shiraz, about 900km (560 miles) south of the capital Tehran, is a major tourist destination because of its closeness to a number of important ancient sites.
It has not been, however, a target of the isolated bomb attacks which have occurred in Iran in recent years.
It has not been a target of the isolated bomb attacks which have occurred in Iran in recent years.
The last major bombing, in the south-eastern city of Zahedan in February last year, is believed to have been carried out by the Sunni Baluchi militant group, Jundallah.
The last major bombing, in the south-eastern city of Zahedan in February last year, is believed to have been carried out by the Sunni Baluchi militant group, Jundallah.
Thirteen members of the Revolutionary Guard Corps were killed when a car bomb exploded next to the bus in which they were travelling.
Thirteen members of the Revolutionary Guard Corps were killed when a car bomb exploded next to the bus in which they were travelling.
The south-western city of Ahwaz, close to the Iraqi border, has seen sporadic anti-government violence since 2005, allegedly by its ethnic minority Arab population.
The south-western city of Ahwaz, close to the Iraqi border, has seen sporadic anti-government violence since 2005, allegedly by its ethnic minority Arab population.
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