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.

A man poses with a sign in front of police officers in riot gear during a demonstration calling on the government to rescue the kidnapped girls from Chibok, in Abuja, on 14 October 2014.

The government failure to secure the schoolgirls' release has sparked mass protests

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.

No group has claimed responsibility for the attack.

Hostage swaps

News of the new abductions came as MPs approved a $1bn (£623m) loan - requested by the president in July - to upgrade military equipment and train more units fighting the north-eastern insurgency.

But they asked the finance minister to give the chamber more details about how the external borrowing would be sourced.

Security already costs the country close to $6bn, roughly a quarter of the federal budget.

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. It has been under a state of emergency, along with neighbouring Adamawa and Yobe states, for more than a year.

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.

Map showing Boko Haram areas of control in Nigeria

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

They forced them to harvest groundnuts on a farm, then abducted those who were teenagers or in their early 20s.

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

Other raids by suspected Boko Haram fighters were reported by residents in Adamawa and Borno over the weekend.

Since the state of emergency was declared in May 2013, Boko Haram has taken many women and children hostage and has agreed to some prisoner swaps.

The name Boko Haram translates as "Western education is forbidden", and the militants have carried out raids on schools and colleges, seeing them as a symbol of Western culture.

Who are Boko Haram?

Boko Haram leader Abubakar Shekau speaking to the camera in a video the group released on 12 May 2014

Boko Haram leader Abubakar Shekau is the most wanted man in Nigeria

Founded in 2002
Initially focused on opposing Western education - Boko Haram means "Western education is forbidden" in the Hausa language
Launched military operations in 2009 to create Islamic state
Thousands killed, mostly in north-eastern Nigeria - also attacked police and UN headquarters in capital, Abuja
Some three million people affected
Declared terrorist group by US in 2013

Who are Boko Haram?

Profile: Boko Haram leader Abubakar Shekau

Will 'truce' with Boko Haram free Chibok girls?