From Wikipedia;
http://en.wikipedia.org/wiki/ Muhsin_ibn_Ali
http://en.wikipedia.org/wiki/
Shi'a sources say that two days after Muhammad's death, Umar al-Khattab led a party of armed men to Ali's house. They called for the men of the house to come out and swear allegiance to Abu Bakr, and also threatened to burn the house down. No one came out, so the armed men pushed their way into the house. Fatima, who was pregnant at the time, was standing behind the door. Umar al Khattab pushed Fatima behind the burning door. He broke her ribs and wrist. Later, she miscarried a boy child, who was called Al Muhsin or Mushabbar.
Fatima was gravely injured in the attack and died of her injuries some time later. One Can refer to LEsan Al Mizan Written by Ibne Hajar Al Asghalani, Then Mizan Al I'tedaal written by Al Zhahaby. Please also refer to the writings of Al Nazaam and #Al saffadi. The statement seen is "Umar Kicked Fatima until she miscarraiged her Som AL-Muhsin);About this Topic there was a discussion in Al Mustaqila TV as well, lasted for 90mins and the Sunni Ulema had afterwards no further comments to add and defend their cliam.
Fatima was gravely injured in the attack and died of her injuries some time later. One Can refer to LEsan Al Mizan Written by Ibne Hajar Al Asghalani, Then Mizan Al I'tedaal written by Al Zhahaby. Please also refer to the writings of Al Nazaam and #Al saffadi. The statement seen is "Umar Kicked Fatima until she miscarraiged her Som AL-Muhsin);About this Topic there was a discussion in Al Mustaqila TV as well, lasted for 90mins and the Sunni Ulema had afterwards no further comments to add and defend their cliam.
The Shi'a believe that both Abu Bakr and Umar were responsible for killing both Muhammad's daughter and grandson. For this section please refer to the Book Al Imamiah Val Syasiyah by Ibn Qutaiba Deinevari, where we clearly See reference to Fatima condemning and Cursing the two.
As Fatima was dying, she asked Imam Ali to bury her in secret; she did not want Abu Bakr and Umar at her funeral.