In contrast, the second opinion is that the group of rebels who martyred ‘Uthman radi Allahu anhu was the same group that incited the fighting between ‘Ali and Amir Mu‘awiyah radi Allahu anhuma.
That group of rebels was present in the army of ‘Ali radi Allahu anhu, and ‘Ammar bin Yasir was also present in the army of ‘Ali radi Allahu anhu.
During the battle, it was this same group of rebels—who only wanted to keep the Muslims embroiled with one another—that killed ‘Ammar radi Allahu anhu as well. However, in terms of evidence, the opinion of the majority of scholars appears to be the stronger one.
And Allah knows best.
(For details, see: Majmu‘ al-Fatawa, Shaykh al-Islam Imam Ibn Taymiyyah: 2/526, 537; Fath al-Bari: 1/701, Darussalam edition, under Hadith: 447)
Source: Bulugh al-Maram: Commentary by Safiur Rahman Mubarakpuri, Page: 1024