Activists said police fired birdshot and live ammunition in Diraz, home to Sheikh Isa Qassim, early today. The cleric lost his citizenship in June over the Sunni-ruled government's allegations that he fueled extremism and laundered money.
The activists, who spoke on condition of anonymity, fearing reprisal, said several people were wounded. Police did not immediately comment.
A wide-scale crackdown on dissent is underway in Bahrain, a Shiite-majority island that hosts the US Navy's 5th Fleet.
The state-run Bahrain News Agency said late yesterday that 20 people faced charges in three separate cases over attacks on suspected police informants. It said one victim "tortured" in Diraz later died.