Officials say a key suspect in Rwanda's 1994 genocide has been arrested.

Rwanda's former intelligence chief Idelphonse Nizeyimana was arrested Sunday in Uganda, according to Uganda government spokesman Fred Opolot.

Nizeyimana will be flown to Arusha, Tanzania, where the International Criminal Tribunal for Rwanda sits.

A police spokeswoman in Uganda said Nizeyimana is believed to have entered Uganda using fake travel documents.

More than half a million members of the Tutsi ethnic minority and moderates from the Hutu majority were slaughtered during the 100-day Rwandan genocide in 1994.

Rwanda's genocide began hours after a plane carrying President Juvenal Habyarimana was shot down.