Iraqis using secret weapons against US tanks

Shortly before dawn on Aug. 28, an M1A1 Abrams tank on routine patrol in Baghdad “was hit by something” that crippled the 69-ton behemoth.
Army officials still are puzzling over what that “something” was.

According to an unclassified Army report, the mystery projectile punched through the vehicle’s skirt and drilled a pencil-sized hole through the hull. The hole was so small that “my little finger will not go into it,” the report’s author noted.

The “something” continued into the crew compartment, where it passed through the gunner’s seatback, grazed the kidney area of the gunner’s flak jacket and finally came to rest after boring a hole 1½ to 2 inches deep in the hull on the far side of the tank.

link http://www.armytimes.com/print.php?f=1-292236-2336437.php

Here is link with the pictures.
http://www.newsru.com/world/05nov2003/secret.html

It is an official US army site. I am wondering who is behind it. Who is providing them with those weapons? what is it? How it works? What else we don't know?
what do you think?

Sabot round, perhaps. Perhaps DU, but who knows. Definately not a shaped charge.

it is strange