Protests on anniversary of Bahrain unrest
14 February 2012 Last updated at 13:30 GMT
A heavy police presence has been trying to prevent people marking the first anniversary of pro-democracy demonstrations in Bahrain's capital, Manama.
Opposition activists have called on protesters to march on the site of the now-demolished Pearl Roundabout - the focus of last year's unrest.
Police have been firing rubber bullets and tear gas at stone-throwing youths.
The BBC's Frank Gardner reports.