Saudi Arabia and the United Arab Emirates sent in 1,500 troops on March 14, 2011 to support the Bahrain government against protesters.
The Islamist Wefaq association, the country's biggest opposition group, said that, by midday on Thursday, at least 10 people had been injured by security forces who they said used live bullets, birdshot and teargas against "peaceful demonstrators".
Three of those injured were in critical condition, the group said in a report on its website.
It posted pictures of injuries, including a limb hit by what appeared to be a live round.
