Nigeria's President Goodluck Jonathan is battling to limit political fallout from last month's suicide bombing of a United Nations building in his nation's capital, as fears about security threaten to overshadow new policies aimed at spurring growth in Africa's second-largest economy.

In recent days, Mr. Jonathan has intensified a crackdown on Boko Haram, the Islamic militant group believed to be behind the Aug. 26 bombing. The attack in the capital, Abuja—one of the deadliest against the U.N.—killed 23 people and wounded 81.

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