Vincent Makori reports on the Chadian troops have entered the northern Nigerian town of Gambaru on the border with Cameroon and are engaged in fierce battle with Boko Haram insurgents, according to military sources at Chad's Army headquarters. We get reports on the Kenya / Turkana oil conflict, World Cancer Day, and an update on the Ebola vaccine in Liberia.Watch the show Monday-Friday @ 1630 UTC/GMT. Visit VOAnews.com and visit us on Facebook.