Jimma was the scene of a violent encounter which started in April 1975 between radical college students (known as "zemacha") sent to organize local peasants, who had benefited from land reform, and local police, who had sided with local landowners. Students and peasant followers had imprisoned local small landowners, rich peasants and members of the local police force; this action led to further unrest, causing the Derg (the ruling junta) to send a special delegation to Jimma, which sided with the local police. In the end, 24 students were killed, more arrested, and the local "zemacha" camps closed.