Police said the officer was trying to buy meat Tuesday when he and the butcher got into an argument that led to the butcher fatally stabbing the officer in the abdomen, the Nigerian Tribune reported.
Soon after, police said street thugs overran the area, and then moved into other neighborhoods, killing eight other people, the newspaper said.
Abdulrahman Akano, police commissioner for Plateau state, of which Jos is the capital, said four people were arrested.
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