A top US defence department official has said Nigeria has been too slow to respond to the threat of Boko Haram but Washington is committed to helping fight the group and rescue more than 200 girls seized from their school a month ago.
US officials have said the effort to retrieve the girls was now a top priority but had been complicated by Nigeria's early reluctance to accept assistance, and by US rules that ban aid to foreign forces that have committed human rights abuses.
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