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A notorious gang leader behind the abduction of more than 300 students in Nigeria in December has been killed by a rival gang, officials say.

Auwalu Daudawa was reportedly ambushed while attempting to steal a herd of cattle from an armed group in the north-western state of Zamfara.

Daudawa is said to have carried out December’s kidnapping in Katsina state.

He was given an amnesty as part of a peace deal in February but reportedly returned to his