Abuja - The U.S. on Monday urged those dissatisfied with the conduct of governorship and state Houses of Assembly elections to seek redress through legitimate means.
This is contained in statement issued by the U.S. embassy in Abuja.
"We have seen the reports of violence and alleged irregularities, particularly in Rivers and Akwa Ibom states.
"We call on those dissatisfied to pursue their grievances peacefully in the judicial arena.
"We regret any loss of life and destruction of property," the statement said.
The statement said it the U.S. had observed that the April 11 polls were improvement on the March 28 presidential and National Assembly elections.
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While congratulating Nigerians on the success of the elections, the U.S. urged on Independent National Electoral Commission to consolidate on the achievements.
"The United States Embassy in Nigeria congratulates the people of Nigeria and the Independent National Electoral Commission for an electoral process on April 11, 2015.
"The process generally went well across the country and built on the success of the March 28 polling process," it said.
The U.S. commended President Goodluck Jonathan and president-elect Muhammadu Buhari for their contribution toward the peaceful conduct of the elections.