Thousands of Cameroonian youths say they marched through the capital to show support for the military's battle against Nigeria's Islamic extremists in the country's north.

In recent months Nigeria's Boko Haram rebels have crossed the border to attack towns in northern Cameroon. About 200 Cameroonian soldiers have been killed in the fighting, according to the organizers, Cameroonian journalists who have reporting on battles.

The demonstrators marched through Yaounde's streets, carrying the flags of Cameroon and Chad, two of the countries that have deployed troops to help the Nigerian army fight Boko Haram.

Journalist Ndi Eugene Ndi said the solidarity march was also to discourage Cameroonian youths from joining the extremist group.