in 2007, the Jerusalem Post reported the following. Per Elder of Ziyon:
A Palestinian from the Gaza Strip, who worked as a metal merchant at the Karni Crossing, was arrested by the Shin Bet (Israel Security Agency) earlier this month for allegedly selling pipes, which he would buy in Israel, to terror groups who used them to manufacture Kassam rockets, it was released for publication on Sunday.
On February 9, the Shin Bet arrested Amar Zak, 37, at the Erez Crossing. During his interrogation, Zak confessed to purchasing metal pipes from Israeli companies and then selling them to Hamas and other terror groups for the manufacture of Kassam rockets, fired almost daily at Israel. In 2006, 1,700 rockets were fired at Israel.