Protests erupted across much of the Arab world on Friday, the Muslim day of prayer, with demonstrators dying in Syria and Yemen while Egyptians staged one of the biggest rallies since President Hosni Mubarak's fall.
Syrian security forces killed at least 10 pro-democracy demonstrators and two were shot dead in Yemen.
In Cairo's Tahrir Square, perhaps the spiritual home of the Arab protest movement, crowds demanded Mubarak's prosecution as discontent with military rule grows, but in Oman heavy security prevented a planned demonstration after Friday prayers.
Friday has become a peak day of protest for many Arabs since popular demands for freedom, democracy and an end to corruption began in Tunisia late last year and spread across the region.