Washington, Dec. 7 -- Amnesty International has gathered detailed eyewitness testimony of the coordinated attack by unidentified gunmen in Baghdad last night, which claimed at least 20 lives and left more than 130 injured.

The organization also verified footage from Baghdad that corroborated testimony of witnesses who described the arrival of fleets of gunmen.

Witnesses describe how "endless gunmen" arrived in pick-up trucks and minivans whilst others who had mingled with the crowd shot and stabbed protesters and attacked and set fire to parts of the Garage al-Sinak building.

"The testimony we have a gathered leaves little doubt that this was a well-coordinated attack and raises serious questions as to how heavily-armed gunmen in a fleet...