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A bomb attack in Iraq has badly damaged one of the holiest sites in Shia Islam,
sparking furious protests.
Thousands of Iraqis have gathered at the al-Askari shrine in Samarra, north
of Baghdad, where two men blew up the famous golden dome in a dawn raid.
Grand Ayatollah Ali al-Sistani, the spiritual head of Iraq's Shia Muslims, has called for a week of mourning.
Shias in Baghdad attacked at least five Sunni mosques in reprisal raids, with disturbances reported in other cities.
The BBC's Jon Brain in Baghdad says the attack was almost certainly designed to raise the existing tensions between the majority Shia and minority Sunni populations.