They died when their shop was set on fire.
Police have reported that detectives arrested and charged the three suspects last week.
Because of a lack of funding the investigation into the killings had been stopped but money from the provincial government allowed police to re-open the case.
Deputy commissioner of police operations, Donald Yamasombi, said the three suspects had been charged with breaking into the building with intent to commit a crime, 10 counts of wilful murder, and arson.
