Five people were killed in a Kenyan slum after fighting broke out between two outlawed groups over extortion, police said on Tuesday, adding that two of them were killed by police who tried to quell the violence. "Officially, we know that three people were killed last night," police spokesman Gideon Kibunjah told Reuters. Kibunjah said the violence in Nairobi's sprawling Mathare slum was by the rival Mungiki and Taliban groups over protection money levied by one of them on brewers of an illegal drink.