Yes, there is a serious risk of terrorism in Chad.  Extremist groups such as ISIS, Boko Haram and Al-Qaida are active across Western Africa.  Lake Chad and certain border locations present a higher risk to international travelers, therefore should be avoided where possible.

It is likely extremist organizations have the capability to mount attacks against foreign travelers if the opportunity is presented.  Remain cautious of the threat and consider the risks if located in remote locations.