ABUJA, Nigeria — A court in Nigeria on Thursday sentenced a top militant leader of an al-Qaida-linked group on the country's most-wanted list to 15 years in prison for illegal mining and using the proceeds to fund terror attacks.

Mahmud Muhammad Usman, who headed the Ansaru group, had pleaded guilty to the charge of engaging in illegal mining to procure arms for his militant group. It was the first conviction on a total of 32 charges brought against him by the Nigerian government.

Usman will remain in the custody of the Nigerian secret police while his trial continues. The other charges mostly include other counts of terrorism and the handling of illegal arms.

Usman was arrested last month along with fellow militant leader Mahmud al-Nigeri in an operation involving several Nigerian law

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