Kamboni militia, launched an amphibious offensive on Kismayo. Al-Shabaab forces withdrew from the city the next day, with the AMISOM forces later moving in. In September 2013, the Westgate shopping mall shooting in Nairobi was reportedly in retaliation for the Kenyan troop presence in Somalia and followed Al-Shabaab warnings that it would attack. See also Drone strikes in Somalia Terrorism in Kenya Notes References Further reading Williams, Paul, "Fighting for Peace in Somalia: A History and Analysis of the African Union Mission (AMISOM)", 2007–2017. Oxford University Press, 2018. Somali Civil War (2009–present) 21st-century conflicts Al-Shabaab (militant group) Military operations involving Kenya Military operations involving Somalia Conflicts in 2011 Conflicts in 2012 2011 in Somalia 2012 in Somalia War on terror 2011 in Kenya 2012 in Kenya Ethiopia–Somalia military relations Ethiopia–Kenya relations Kenya–Somalia military relations Ethiopia–United States relations Kenya–United States relations Somalia–United States military relations Battles in 2012 Battles in 2011