A former Burundian president is urging members of the U.N. Security Council to help investigate allegations of mass graves amid a wave of extrajudicial killings.

Jean-Baptiste Bagaza told The Associated Press on Friday: "Members of the U.N. (Security Council) must not listen to any more excuses from the Burundi government, because President Pierre Nkurunziza has failed to protect Burundians. With the formation of armed rebellion, Burundi is headed for destruction."

Members of the U.N. Security Council arrived in Burundi Thursday to help end months of violence that stemmed from the president's decision last April to seek a third term.

Bagaza said he wants the U.N. to investigate alleged extrajudicial killings and to help with the exhumation of bodies of Burundians said to have been buried in mass graves.