"Since 2005, the most intractable terrorist threat in Sub-Saharan Africa has come from the Somalia-based Islamist terrorist group known as 'Harakat al-Shabaab,' or colloquially as 'al-Shabaab.' Translated into English as 'The Youth' or 'The Guys,' al-Shabaab has wreaked havoc throughout East Africa since the group's formation in 2005, attacking Somali government forces, civilians, and representatives of the international community in its bid to install a strict interpretation of sharia law in the country, oust the non-Somali outsider forces fighting it, and contribute to the broader global jihadi struggle. [...] In the course of its violent campaign, al-Shabaab has used a range of tactics. These include the use of gunmen, IEDs, drive-by shootings, targeted assassinations, ambushes, and raids, among others. In addition, the group is known to use stonings, amputations, and beheadings to punish and intimidate those in its area of control who do not abide by its interpretation of sharia. Yet perhaps the most pernicious--and little-understood--tactic in al-Shabaab's arsenal of violence is its use of suicide bombers."
Combating Terrorism Center: https://ctc.usma.edu/