Two dozen Nigerian girls who were kidnapped from their boarding school last week in the country's northwest have been released, the presidency announced on Tuesday.

Nigeria has suffered a string of abductions of schoolchildren since Islamist group Boko Haram kidnapped 276 girls in Chibok in the restive northeast in 2014, sparking an international outcry.

"President Bola Tinubu has welcomed the release today of the 24 schoolgirls abducted by terrorists in Maga," Kebbi State, on November 17, said a statement from Bayo Onanuga, special adviser to the Nigerian president.

Authorities had said a gang armed with "sophisticated weapons, shooting sporadically" attacked the school overnight, leaving a school official dead and a security guard injured.

The assailants had kidnapped 25 girls, but one was able to escape soon after, authorities said.

While applauding security agents, Tinubu has requested they "make more efforts to rescue the remaining students still being held captive", Tuesday's statement said.

The Kebbi attack triggered other "copycat kidnappings" over the past week, it added.

Earlier on Tuesday, police said gunmen seized 10 women and children in an overnight raid in the western state of Kwara.

That raid targeted the village of Isapa, which neighbours another village where at least 35 people were kidnapped a week before.

Last week, armed gangs also seized more than 300 children from a Catholic school in Nigeria's north-central Niger state and 13 girls in the eastern state of Borno.

Africa's most populous country is facing a long-running security crisis fuelled by jihadist attacks and violence by "bandit" gangs that raid villages, kill people and kidnap for ransom.

Kwara state police commissioner Ojo Adekimi said the attackers in the latest raid were herders who had "shot sporadically" and seized women and children from local farming families.

One woman managed to escape and return to the village, he said.

The raid comes one week after gunmen killed two people and kidnapped at least 35 worshippers in an attack on a church in Eruku, around 20 kilometres from Isapa.

The abducted worshippers have since returned home. (AFP)