On Saturday, in the village of Malkiya, police disrupted mourning ceremonies traditionally held in the lunar month of Muharram, tried to remove black flags put up by the locals, and then opened fire on the Shias.
The attack injured three people, including a 23-year-old who sustained gunshot wounds in the head and neck but was said to be in serious but stable condition.
The other two sustained rubber bullet wounds to the abdomen.
Bahrain is predominantly Shia but the Persian Gulf kingdom is ruled by a Sunni minority.
The Bahraini authorities have increased the pressure on Shia Muslims over the past few months, with reports of numerous arrests and torture at detention centers raising concern about the human rights situation in the country.
Hundreds of people, including prominent Shia clerics and human rights activists, have been arrested since mid-August, and security forces have harshly put down street protests.
Human rights groups have condemned the crackdown, criticizing Manama for silencing dissent by force.
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