More than 60 women and girls abducted last month by suspected Boko Haram militants in northeast Nigeria have escaped their captors, sources say, but more than 200 schoolgirls are still being held.

Local vigilante Abbas Gava said he had “received an alert from my colleagues … that about 63 of the abducted women and girls had made it back home” late on Friday.

A high-level security source in the Borno state capital Maiduguri, who requested anonymity, confirmed the escape.

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Gava, a senior official of the local vigilantes in Borno who are working closely with security officials, told journalists the women escaped when their captors went out to fight.

“They took the bold step when their abductors moved out to carry out an operation,” he said on Sunday.

Clashes took place between the Islamists and the army late Friday after an attack by the insurgents in the town of Damboa, where 53 of them and six soldiers were killed, the army said.

The rebels attacked barracks and a police station while most of the troops were out on patrol in surrounding villages.

Spokesmen for the armed forces or the government could not be reached Sunday for comment on the latest developments in the kidnapping cases.

Activists of the Bring Back Our Girls movement meanwhile tried to march on the presidential palace in Abuja Sunday to pressure the government over the fate of more than 200 girls kidnapped in Chibok, in Borno, on April 14, but were asked by security forces to turn back.

“It’s 83 days today that the girls have been abducted,” activist Aisha Yesufu told the press.

“We have been coming out for 68 days and nobody has really listened to us,” Yesufu told reporters after the march.

Of the 276 girls seized in April, 57 have escaped while 219 are still missing.

The insurgents’ kidnap of the schoolgirls in April provoked international outrage and drew unprecedented global attention to the Islamist uprising.