Tear gas has been fired at several dozen people protesting the execution by Saudi Arabia of prominent cleric Nimr al-Nimr.
Demonstrators carrying pictures of the cleric clashed with security forces in the village of Abu-Saiba, west of the capital Manama.
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The slump will spark scrutiny, especially as statistics show a rise in racially or religiously motivated offences following the EU vote.
The 53-year-old was killed shortly after leaving her home in Mosta, Prime Minister Joseph Muscat said.