Muhammad ibn Ali al-Hadi Mausoleum attack
On 7 July 2016, at least 56 people were killed and 75 injured after a group of attackers stormed the Mausoleum of Sayid Mohammed bin Ali al-Hadi, a Shia holy site in Balad, Iraq. The attackers included suicide car bombers, suicide bombers on foot, and several gunmen.
Source: Wikipedia — Muhammad ibn Ali al-Hadi Mausoleum attack (CC BY-SA 4.0)