The Islamist militant group Al-Shabaab has been opposed to Kenyan involvement in the Somali Civil War . The terrorist group has previously attacked the suburb of Westlands during the 2013 Westgate shopping mall attack , which left 67 people dead . In 2015 , Al-shabaab terrorists were involved in mass shooting of Garissa University College students leaving 147 dead and many others injured . This incident was the country 's worst terrorist attack since the 1998 United States embassy bombings , which left over 200 people dead
mass shooting
Garissa University College attack
Nairobi DusitD2 complex attack