Police have fired tear gas and stun grenades at dozens of anti-government protesters in Bahrain. The protesters had defied a ban on unauthorized demonstrations to march in the centre of the Bahraini capital. Armoured security forces vehicles and riot police closed off some of Manama's main roads on Friday to prevent protests. Protesters still found ways to make it to the march, which had been called by the country's main opposition bloc al-Wefaq. They were calling for all "prisoners of conscience" being held by the government to be released.