Israeli metal used for Kassam rockets Mar 4, 2007 Amar Azk, 37 [a metal merchant at the Karni crossing] was arrested Feruary 9, During his interrogation, he confessed selling the pipes to Hamas and other terrorist organizations that manufactured Kassam rockets, fired almost daily at Israel.
The pipes that were sold to Zak were intended for the construction of a sewage system in Gaza. http://www.jpost.com/servlet/Satellite?cid=1171894568749&pagename=JPost/JPArticle/ShowFull