At that time there was also a long-standing animosity between the Bugis Malays (the Selangor royal family were of Bugis origin) and the Sumatran Batu Bara ethnic groups. Raja Abdullah, also a Bugis, refused to punish a member of the Bugis Malays he had sent to guard Bukit Nanas who then murdered a villager from the Batu Bara ethnic group. Angered by Raja Abdullah's refusal to take action against the murderer nor pay compensation for the death of one of his men as an alternative, the Batu Bara Malays' leader Mohamed Akib, informed Raja Mahdi of the incident and offered his support for him if he wanted to fight against Raja Abdullah. Raja Mahdi, supported by the Sumatran traders, then laid siege to the fort of Klang (now known as Raja Mahadi fort). Mohamad Akib however was shot and killed in 1867 while fighting at the fort, and his younger brother Mohamed Tahir assumed leadership. Mohamad Akib's body together with several other slain Sumatran Malays were buried within the grounds of the fort, whose graves still remain there to this day.