While the group is unlikely to rally a crowd of that size, support for the movement has been growing on Twitter under #BringBackOurGirls.
Pogo Bitrus, leader of a Chibok elders group, told AFP that locals had been tracking the movements of the hostages with the help of “various sources” across the northeast.
“From the information we received yesterday from Cameroonian border towns our abducted girls were taken… into Chad and Cameroon,” he said.
The girls were then sold as brides to Islamist fighters for 2,000 naira ($12) each, Bitrus added.
There was however no independent confirmation of his report and the defence ministry did not immediately answer calls seeking comment. READ: Nigeria parents face ‘nightmare’ after mass kidnap by Islamists.
Some of the girls who escaped have said the hostages were taken to Borno’s Sambisa Forest area, where Boko Haram has well-fortified camps.
Boko Haram’s name translates as “Western education is forbidden”, and it has repeatedly attacked schools during an insurgency aimed at creating a strict Islamic state in mainly Muslim northern Nigeria.
The Islamists have set schools on fire, massacred students in their sleep and detonated bombs at university campus churches.
President Goodluck Jonathan has faced scathing criticism over the attacks and the pressure has mounted since the Chibok kidnappings.
Locals have scoured the bushlands of the remote region, pooling money to buy fuel for motorcycles and cars to conduct their own rescue effort, saying they have no confidence in the military’s search.