(CNN) – Sixty-three women and girls kidnapped by Boko Haram last month in Nigeria escaped from their captors and have returned to their burnt village, a security source and a local vigilante fighting the militant group said. The hostages were seized from the Kummabza village in northern Borno state on June 18 after a four-day invasion of the village by Boko Haram insurgents. The militants killed 30 men and burned the entire village. Their escape is good news, but the Islamist terrorist group is still believed to be holding about 200 schoolgirls abducted April 14 from their hostels in the town of Chibok — a case that drew international outrage and prompted a global campaign for their release.