Abstract
Terrorism has been a major threat to global peace and security in the recent years. The rate at which terror groups keep changing has brought concerns to various security stakeholders and to local communities affected. The Al-shaabab terror network that operates in the horn of African has been a major concern to various neighbours of Somalia with Kenya being the most affected Garissa County. The Al-shaabab activities which have largely been associated with extreme Islamic teachings have been a concern in the county. The study was underpinned by the Rational Choice Theory. The sample size was 384. The study was conducted in Garissa County. The results showed that there was a relationship between Islamism and Al-shaabab activities Garissa County. The Al-Shabaab militia had on many occasions used extreme teaching to justify their terrors attacks in Garissa county in the name of jihad which had caused serious concerns in the area.