A Christian aid organization says six people are dead after overnight violence in a central Nigerian region beset by religious and ethnic killings.

Mark Lipdo, an organizer for the Stefanos Foundation, told journalists Friday that another five people were wounded in an attack in a south neighborhood of Jos. Plateau state police commissioner Abdurrahman Akanu said officers were now investigating the attack.

Human Rights Watch says at least 1,000 people were killed in Jos in 2010 and another 200 more have died since Dec. 24. Violence there cuts across religious lines, but often finds its root in political, economic and ethnic strife.