looks like it was another SAM
From CNN:
"Sources with the 4th Infantry Division told CNN they suspect a
Soviet-built Kolomna KBM Strela-3 low-altitude surface-to-air
missile (SAM) hit the helicopter, using an infrared guidance
system."
http://www.cnn.com/2003/WORLD/meast/11/09/sprj.irq.main/index.html