Update: Here is a video from the incident:
MADINAH: Madinah Gov. Prince Abdul Aziz bin Majed ordered yesterday the release of all youths under 18 detained in connection with a fight near the Prophet’s Mosque early this week.
The order was issued on the directive of Interior Minister Prince Naif.
The youths are to be released on guarantees from their guardians.
The investigation into the involvement of other detainees in the fight would continue, Col.
Mohsin Al-Radadi, Madinah police spokesman, told Arab News yesterday.
The youths clashed with worshippers at the mosque on Monday evening but there were no casualties.
Another source claims it was a Sunni vs. Shia fight. The Shia were pilgrims, while the Sunnis were the mutawwa or religious police:
Nine held in clashes at Madinah
RIYADH: Saudi authorities have arrested nine people following clashes at the Prophet Muhammad’s mosque in Madinah, an official said yesterday. Some pilgrims clashed with worshippers at the mosque but there were no casualties, interior ministry spokesman Mansur al-Turki said.
Turki declined to comment on reports on Shia websites that the clashes were sectarian and pitted Shias against Sunnis.
“The security authorities will issue a statement later to clarify what happened, the nationalities of the participants in the fight and their motives, once the investigation is over,” Turki said.
Saudi newspapers have reported that on Friday religious police at a shrine in Madinah clashed with pilgrims, who responded by hurling stones at a police station.
Iran’s Arab-language satellite channel quoted witnesses as saying that on Monday evening two Saudi Shias from Al-Qatif in the oil-rich east of the kingdom were killed and four others wounded by anti-riot police.
Saudi group Human Rights First said religious police had attacked Shia pilgrims in Madinah. They condemned the attack, calling on the government to launch an investigation and bring the perpetrators to justice. – AFP
I don’t really know where the truth is, but I’ll update as I find reliable sources, inshaAllah.