LAGOS, Nigeria (CNN) -- The U.S. Embassy in Nigeria warned Sunday that it had received threats of a possible attack on diplomatic missions in Lagos, the nation's most populous city.
"As a result of this information, Nigerian police have heightened their vigilance along Walter Carrington Crescent and are monitoring traffic more closely," the statement read, referring to the location of the U.S. Consulate General.
The embassy, which declined to provide any more information, urged U.S. citizens in the capital Abuja, and Lagos, to be vigilant and aware of their surroundings.
The United States has an embassy in Abuja and a consulate office in Lagos.
The Western African nation has a population of about 149 million.