More students who had been kidnapped in northern Nigeria have been released after payment of ransom.

Some 10 students were released on Sunday, according to a local Christian association, leaving only 11.

The head of the association, Joseph Hayab, said they were working on the release of the remaining students.

This is the fourth batch of students to be released by the kidnappers. A total of 110 students have either been released or have escaped so far.

Some 121 students from Bethel High School students were kidnapped on 5 July in Kaduna state in northern Nigeria.

Three of the kidnappers were arrested and police paraded them last week.

School kidnappings have been on the rise in Nigeria, with abductors demanding millions of the Nigerian currency in ransom payments.