Iraqi anti-government protesters throw rocks over a makeshift barricade in al-Rasheed street near Baghdad's al-Ahrar bridge during clashes with security forces.

Three anti-government protesters were killed in clashes with security forces on bridges across the Tigris in the Iraqi capital Friday, a medical source said.

More than 340 people have died and thousands have been

wounded since rallies against widespread graft and unemployment erupted in

Baghdad and the mostly-Shiite south last month.

Protesters have occupied the capital's iconic Tahrir

(Liberation) Square for four consecutive weeks, spreading out onto bridges leading to the western bank of the river Tigris.

Security forces have set up concrete barriers and checkpoints to protect the zone from angry protesters they fear may try to storm buildings. (AFP)

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