A legal adviser for Bahrain's main opposition group says its leader has been charged with insulting authorities through an exhibition that showed alleged abuses against anti-government protesters in the Gulf nation.

It's unclear whether Ali Salman, the head of the Shiite bloc Al Wefaq, will face trial, which could touch off wider clashes between Shiite-led protesters and Bahrain's Western-backed Sunni rulers. Prosecutors have the option of not bringing the case to court.

Al Wefaq's lawyer Hadi al-Musawi said Salman was not jailed after being charged and was allowed to return home following questioning Sunday

Riot police last week raided the museum-style hall opened by Al Wefaq that included depictions of alleged torture and attacks against protesters since the uprising began in February 2011. Authorities said the displays incited "hatred."