Ivorian officials say 11 people in a major cocoa-growing region have been killed in an attack believed to have been triggered by a land dispute.

Officials say the incident happened Thursday when the assailants attacked their victims in the village of Siegouekou.

A senior presidential source tells the Reuters news agency that the assailants smashed down doors with guns and knives, cut the throats of some people and fired at point blank range on others.

Clashes involving rival ethnic groups over precious cocoa land are common in the area. Ivory Coast is the world's leading producer of cocoa, the key ingredient in chocolate.

Some information provided by AP and Reuters.