Abu Mussab al-Zarqawi is considered to be an important link between Iraq and the Al Qaeda terrorist organization. A Jordanian of Palestinian ancestry, Zarqawi is believed to have set up a terrorist cell in Baghdad and to be affiliated with Ansar al-Islam, a small militant group in northern Iraq that has ties to Al Qaeda. Al-Zarqawi's group is known as Al Tawhid, described as an "affiliate" of Al Qaeda. Identified as one of Al Qaeda's top chemical weapons experts, al-Zarqawi has also been linked to Al Qaeda cells discovered in England. The English cells appeared to be manufacturing ricin, a deadly poison used as a biochemical reagent.