The Nigerian government accused human rights group Amnesty International of "damaging the morale" of its soldiers fighting terrorism, as part of an ongoing argument with foreign nongovernmental organizations.
Amnesty International, in a report released this week, alleged that military troops ignored warnings of imminent attacks in Nigeria's volatile central states, where it said more than 3,000 people have died in three years.
Soldiers sent to prevent attacks in the area were "slow to act," even when they were close to the scene of attacks, the human rights group said in the report.
"Our research shows that these attacks were well planned and coordinated, with the use of weapons like machine guns and AK-47 rifles," said Osai Ojigho, Amnesty International's Nigeria director.
"Yet little has been done by the authorities in terms of prevention, arrests and prosecutions, even when information about the suspected perpetrators was available."
It alleged authorities failed to investigate the spate of violence and punish perpetrators of the attacks, inciting more attacks across the West African nation.
"The Nigerian government has displayed what can only be described as gross incompetence and has failed in its duty to protect the lives of its population and end the intensifying conflict between herders and farmers," Ojigho said.
"The authorities' lethargy has allowed impunity to flourish and the killings to spread to many parts of the country, inflicting greater suffering on communities who already live in constant fear of the next attack," she added.
The Nigerian government, in response to Amnesty allegations, accused the independent organization of stoking terror through "bias and inaccuracies" in its report.
Amnesty is at risk of losing its reputation as an impartial organization, presidential spokesman Garba Shehu said in a statement on Monday.
"The federal government is increasingly concerned about the role that Amnesty International is playing in the war against terror in Nigeria," Shehu said.
Nigerian President Muhammadu Buhari urged the UK-based rights group to examine its operations in the country, especially as they relate to the war against terrorism, Shehu said.