Washington orders its non-emergency employees and their family members to depart the West African country's main city, citing a "heightened risk of terrorist attacks."
Nigeria urges residents to stay calm and take "necessary precautions," with police ordering a counterterrorism exercise in Abuja, where US and UK warn of possible terror attacks.
Washington deeply alarmed by the frequency of such attacks in recent months.
At least 310 people were killed and hundreds more injured in a series of apparently coordinated attacks across Sri Lanka on Easter Sunday.
Pakistan is due to vote on Wednesday in general elections overshadowed by deadly terrorist attacks.
A wave of terrorist attacks has rocked the South Asian country this week after a period of relative calm.
The Somali militant group Al Shabaab has killed dozens in the region in recent months.
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