Waves of protesters block main Bahrain highway

Bahraini anti-government protesters set up makeshift roadblocks in Manama on Sunday
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Bahraini anti-government protesters set up makeshift roadblocks in Manama on March 13, 2011. Bahraini police clashed with demonstrators trying to occupy Manama's banking centre, as protests spread from a peaceful sit-in to the heart of the strategic Gulf state's business district. (AFP/Getty Images)
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Bahraini anti-government protesters set up makeshift roadblocks in Manama on March 13, 2011. Bahraini police clashed with demonstrators trying to occupy Manama's banking centre, as protests spread from a peaceful sit-in to the heart of the strategic Gulf state's business district. (AFP/Getty Images)
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Tear gas is fired by Bahraini police explode among the protestors gathered close to Pearl Square, the epicentre of anti-government protests, the first time since demonstrators began an anti-regime sit-in there last month on March 13, 2011, in Manama. Almost a month into protests calling for deep political change in Bahrain, anti-government demonstrators and the Gulf kingdom's rulers appear to be at an impasse, with neither side backing down. (AFP/Getty Images)
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A protester over come by tear gas is ferried away as Bahraini police fire tear gas at protesters in Pearl Square, the epicentre of anti-government protests, the first time since demonstrators began an anti-regime sit-in there last month on March 13, 2011, in Manama. Almost a month into protests calling for deep political change in Bahrain, anti-government demonstrators and the Gulf kingdom's rulers appear to be at an impasse, with neither side backing down. (AFP/Getty Images)
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Shiites Muslim protesters face police riot close to Pearl Square, the epicentre of anti-government protests, as they block a near by high way connecting the capital Manama with Muharraq Island, on March 13, 2011. Almost a month into protests calling for deep political change in Bahrain, anti-government demonstrators and the Gulf kingdom's rulers appear to be at an impasse, with neither side backing down. (AFP/Getty Images)
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Thousands of people demonstrate against the Bahraini monarchy outside one of the king's palaces in Malkiya, near Manama on March 12, 2011, a day after a failed attempt to march on another royal palace. Anti-government protests in Shiite-majority but Sunni-ruled Bahrain broke out on February 14, after popular uprisings in Egypt and Tunisia toppled those countries' long-time autocratic rulers. (AFP/Getty Images)
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A protester over come by tear gas is ferried away as Bahraini police fire tear gas at protesters in Pearl Square, the epicentre of anti-government protests, the first time since demonstrators began an anti-regime sit-in there last month on March 13, 2011, in Manama. Almost a month into protests calling for deep political change in Bahrain, anti-government demonstrators and the Gulf kingdom's rulers appear to be at an impasse, with neither side backing down. (AFP/Getty Images)