Washington concerned that Boko Haram might try to attack American interests in Nigeria.

"Fragmentary evidence” and a sense of inevitability that Boko Haram may be planning an attack on U.S. interests in Nigeria has intelligence and counterterrorism officials in Washington on alert. U.S. intelligence officials, speaking with NBC News on condition of anonymity, declined to characterize the nature of the evidence, other than to say it was recent and non-specific. But they said it is prompting efforts to locate the terrorist group’s “military assets” and identify other senior leaders beyond Abubakar Shekau.

They also said that Boko Haram’s desire to strike against a U.S. target apparently has been heightened by the increasing U.S. involvement in the hunt for 276 missing Nigerian schoolgirls abducted by the group last month, though the goal itself is not new.

Read it at NBC News.