It contained the shrines of Ammar ibn Yasir and Owais al-Qarani, who died in the Battle of Siffin in 657, which took place around 40 km (25 miles) west of Raqqa.
In 1988, Syrian president Hafez al-Assad and the Supreme Leader of Iran, Ruhollah Khomeini, initiated a project to develop a new mosque around the tombs.
[3] In June 2013, rebel fighters from al-Muntasereen Billah militia were living in the mosque complex.
[4] On March 26, 2014, the mosque was blown up by two powerful explosions and completely destroyed by the Islamic State because it was a Shi'a structure.
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