Nigerian authorities are still hunting for the alleged mastermind of last month's deadly U.N. headquarters bombing.
They said Sunday that a 25 million naira ($160,000) reward is being offered for information leading to Mamman Nur's capture.
At least 23 people were killed when a suicide bomber driving a Honda sport utility vehicle attacked the U.N. headquarters in Nigeria on Aug. 26.
Four men accused of organizing the attack have been charged and could face the death penalty, however Nur remains at large.
A radical Muslim sect known locally as Boko Haram claimed responsibility for the bombing. The group, which is reported to have links to other al-Qaida-affiliated militants, has bombed locations around Nigeria in the last year.