Abu Bakr. The scene soon grew violent, and Zubayr was disarmed and carried away. The mob, however, retreated without Ali's pledge after Fatima pleaded with them, as reported in al-Imama wa al-siyasa. Alternatively, al-Baladhuri states that Ali capitulated and pledged allegiance to Abu Bakr immediately after Umar's threat. In contrast, the canonical Sahih al-Bukhari and Sahih Muslim relate that Ali pledged to Abu Bakr after Fatima died. Attack on Fatima's house It is uncertain what followed the above altercation at Fatima's house. Some Shia sources report that Fatima suffered injuries during a raid on her house led by Umar, including the canonical Kitab al-Kafi. The allegations of violence are categorically rejected by Sunnis, though such claims appear in some Sunni historical sources: In his al-Saqifa wa Fadak, al-Jawhari () includes a tradition to the effect that Umar and his men first threatened to set Fatima's house on fire. Then they entered the house, despite her pleas, and forced Ali and his supporters out of the house. The remainder of the account in al-Imama wa al-siyasa describes that Ali was pulled out of his house by force and threatened with death, according to Khetia. Mu'awiya () is known to have alluded to the violent arrest of Ali in a letter to him before the Battle of Siffin. Al-Tabari notes that Abu Bakr regretted the events after Saqifa on his deathbed, writing that Abu Bakr wished he had "never opened Fatima's house to anything, even though they had locked it as a gesture of defiance." Modern views Madelung is uncertain about the use of force. Still, he notes that there is evidence (in Sunni sources) that Fatima's house was searched. According to Madelung, Ali later repeatedly said that he would have resisted (Abu Bakr) had there been forty men with him. Alternatively, Buehler suggests that the allegations of violence should be treated with caution as they reflect the political agendas of the time. In contrast, Veccia Vaglieri is of the view that the Shia allegations are based on facts, even if they have been exaggerated. Abbas writes that some well-regarded Sunni sources mention Umar's raid and Fatima's injuries. Sunni view Some Sunni authors record a fifth child of Fatima, named Muhsin. These include al-Baladhuri who maintains that Muhsin died in infancy. Al-Mas'udi and al-Ya'qubi also list Muhsin among the children of Fatima without alluding to miscarriage, though they have both been accused