source: AFP
actor1: Al Shabaab
actor2: Military Forces of Kenya (2013-)
location: Mandera
notes: 03 May. Al Shabaab attacks Mandera, killing four 'non-Muslim' quarry workers. Several other injuries reported. The police later 'rescued' 150 workers involved in the incident. However, it is not certain if any of the workers were held hostage at any point.