Nigeria's federal police want to interrogate the leader of the nation's human rights commission over comments he's made about so-called "extrajudicial" killings in the country.

Lawyers for Chidi Anselm Odinkalu said Monday authorities in Nigeria's capital Abuja demanded he appear before investigators to talk about an address he gave on police killings. His lawyers say Odinkalu's figures came from well-regarded studies on the killings in Nigeria.

A federal police spokesman said he had no information about the requested interrogation.

A December 2009 Amnesty International report alleged that police in Nigeria each year kill hundreds of people with impunity.