Riot police in Bahrain fired tear gas and stun grenades today as tens of thousands of protesters staged the biggest anti-government demonstrations in weeks in the divided Gulf nation.

Bahrain’s security court has convicted 33 more activists on charges that include violence and attempted murder during anti-government protests and sentenced them to prison terms.

Bahrain’s special security court has sentenced a protester to death for killing a policeman, and jailed doctors and nurses who treated injured protesters during the uprising earlier this year, a lawyer said.