Following Husayn's death, Ibn al-Zubayr began clandestinely recruiting supporters. By September 683, he had taken control of Mecca. He referred to himself as "al-ʿaʾidh biʾl bayt" (the fugitive at the sanctuary, "viz.", the Ka'aba), adopted the slogan "lā ḥukma illā li-ʾllāh" (judgement belongs to God alone), but made no claim to the caliphate. Yazid ordered the governor of Medina, Amr ibn Sa'id ibn al-As, to arrest Ibn al-Zubayr. The governor, in turn, charged Ibn al-Zubayr's estranged brother, the head of Medina's "shūrṭā" (security forces), Amr, to lead the expedition. The Umayyad force was ambushed and Amr was captured and killed in captivity. Ibn al-Zubayr declared the illegitimacy of Yazid's caliphate and allied with the Ansar of Medina, led by Abd Allah ibn Hanzala, who had withdrawn support for Yazid due to his alleged improprieties. Ibn al-Zubayr also gained the support of the Kharijite movement in Basra and Bahrayn (eastern Arabia); the Kharijites were early opponents of the Umayyads who had defected from Caliph Ali because of his participation in the 657 arbitration.