Prisoners allege Koran trampled by Syrian guards in Damascus prison riot.
Syria's government has blamed prisoners serving sentences for extremism and terror for clashes with jail guards that left several inmates dead.
Prisoners say the unrest began early on Saturday when guards began beating the mainly Islamist inmates in their cells.
The government has denied this, saying the guards intervened to stop violence begun by inmates during an inspection.
It remains unclear how many detainees were killed and injured in the unrest. A human rights group said 25 were dead.
The Islamist prisoners were also reported to have taken a large number of other inmates hostage but it is not clear whether they have been released.
Several prisoners managed to contact Syrian human-rights groups, as well as the BBC, by telephone from inside Saydnaya Prison, near Damascus, as the unrest was going on.
The Syrian Observatory for Human Rights said on Saturday that at least 25 prisoners had been killed and others hurt when security forces fired live bullets to quell the unrest.
The London-based group quoted a political prisoner as saying that the riot had been started by Islamist inmates after aggressive raids on their cells by the guards.
The prisoners said the early-morning raids were in response to a protest by detainees several weeks ago about conditions at the jail, which houses chiefly Islamist and political prisoners.
One inmate told the BBC the guards had roughly treated the prisoners during the raids and had desecrated the Koran.
"They shackled our hands behind us, confiscated our clothes and possessions, and beat us. And they insulted the Koran, they trod on the Koran," he told the BBC's Arabic service.
So what denomination were these Koran stomping guards? Secular “Muslim for identification only”? Sunni v Shia? Christians? Are there enough Christians left in Syria to be in positions of authority and strength? Druze? I don’t know enough about the Alawites. Will the prison governor apologise and give out a new copy of the Koran in a solemn ceremony? That I do doubt.
