Up to 100 people have been wounded in Yemen's capital Sanaa after police fired live bullets and tear gas at anti-government protesters, reports said.
In the latest clashes between security forces and demonstrators, at least one person was in a critical condition after being shot and more than 20 suffered gas inhalation.
Hospital reports also claimed protesters had been attacked by police and regime-supporters wielding clubs and machetes.
At least seven people have been killed in two days, including a teenage boy, in the escalating violence across the country.
In Sanaa, fighting broke out on Saturday when police moved in on a camp occupied by protesters near the city's university.
Officers fired live bullets, tear gas and water cannons while the crowds responded with a hail of rocks.
The demonstrators want president Ali Abdullah Saleh, who has been in power for 32 years, to step down.
Doctors in Sanaa claimed the tear gas used against the protesters was toxic as it appeared to affect the nervous system.
An injured protester is treated in a mosque yard in Yemen's capital
The accusation was dismissed by Yemen's interior ministry, but protesters were quick to erected banners labelling the president "Chemical Ali".
The US government, which considers Mr Saleh an ally in its fight against an al Qaeda cell based in Yemen, said it was concerned by the increasing violence.
"We call on the Yemeni government to quickly investigate these incidents," US state department spokesman PJ Crowley.
"People everywhere share the same universal rights to demonstrate peacefully and to freely assemble and express themselves."
More than 30 people have now been killed across the country since political unrest began two months ago.
The protests have been inspired by recent uprisings in Tunisia and Egypt, which saw leaders Zine al-Abidine Ben Ali and Hosni Mubarak forced from office.
Tear gas is fired at protesters near Manama's Pearl roundabout
But President Saleh has refused to budge and instead offered to re-write the constitution and transfer powers to parliament.
Elsewhere in the region, police in Bahrain fired tear gas and rubber bullets at protesters in the capital Manama.
An operation to clear a protest camp at the city's Pearl roundabout was the largest effort to disperse demonstrators from the city.
It came after a large crowd blocked a major highway leading to and from Manama's financial district, causing traffic chaos as Sunday is the first day of the working week in Arab nations.
The government said in a statement it had moved to end the blockade after a group attacked unarmed police - one officer was stabbed and another suffered a head wound.
The mostly Shi'ite protesters want greater political freedoms under the ruling Sunni royal family and have used the Pearl site as the base for their political unrest.
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Here's a suggestion... that NO-ONE will listen to anyway, nut it's relevant!
PEOPLE in the WEST do NOT find your screams of, "Aly At The Bar!Q"... or whatever... find your religion.... erm... 'offish'... at this moment in time!
I, as I'm sure many on sites such as LiveLeak, have had our own experiences with coppers... but we DO NOT run at them shouting, "God's Great... now 'ave it!!", as I hurled rocks at 'em!? - Personally, I'd appreciate JUST a rubber bullet in the mush if I did!?
...just a thought....
In: News, Middle East
Tags: , , , , , yemen, , , , , bahrain, , , , , islam, , , , , muslim, , , , , syria, , , , , iran, , , , , algeria, , , , , jordan, , , , , iraq, , , , , morocco, , , , , saudi, arabia, , , , , najran, , , , , qatif, , , , , al, ahsa, , , , , uae, , , , , kuwait, , , , , qatar, , , , , oman, , , , , egypt, , , , , tunisia, , , , , turkey
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