Dozens of women and girls from two villages in Nigeria's north-eastern Adamawa state have been abducted by suspected militants, residents say.

The abductions have not been confirmed by the authorities, but residents say they took place a day after the military announced it had agreed a ceasefire with the Boko Haram group.

The government hopes the Islamist group will free more than 200 girls seized in April as part of negotiations.

Boko Haram has not confirmed the truce.

Following Friday's ceasefire announcement, the government said further talks with Boko Haram were due to be held this week in neighbouring Chad.

In a separate incident, at least five people were killed in a bomb blast at a bus station in a town in the northern state of Bauchi.

Nobody has claimed responsibility for the attack.

The abduction of the schoolgirls from their boarding school in Borno state sparked a global campaign to pressure the government to secure their release.

Borno is the group's stronghold, and has been under a state of emergency along with neighbouring Adamawa and Yobe states for more than a year as part of attempts by the military to put down the insurgency.

The villages that were attacked on Saturday - Waga Mangoro and Garta - are close to Madagali and Michika towns, which have been under the control of the Islamist militant group for several weeks.

According to people in the area, a large group of insurgents attacked the villages, rounding up women and young girls.

Communication with the affected area is difficult, which is why it takes time for news of attacks to filter out.