Chad has rejected UN accusations that its troops killed 30 people and injured many more in an unprovoked attack in a market in the Central African Republic.
In a statement, Chad’s government expressed its indignation and said the allegation was “defamatory”.
It came as UN Secretary General Ban Ki-moon made a surprise visit to CAR in a show of support for efforts to end the sectarian conflict there.
Thousands of African and French troops are trying to restore order.
Chad has said it will pull its peacekeepers out of CAR in protest at the UN’s claims.
On Friday the UN said an investigation had found Chadian troops “opened fire on the population without any provocation” inside a busy market in Bangui on 29 March.
Thirty people were killed and another 300 people were injured in the shooting, it said.
Wave of violence
The troops, who were reportedly on a mission to evacuate some of the city’s remaining Muslim inhabitants, said they were attacked first by militias.
In the year since the Muslim Seleka rebels ousted the CAR government last March, the country has been engulfed by a wave of religious violence.