The United Nations says at least four of its peacekeepers were involved in the rape of a woman in Mali.
The soldiers have been identified as being among 1,500 Chadian troops serving under the UN force, Minusma. The UN says it wants Chad to investigate the incident and take disciplinary action against the men.
Minusma took over security duties in July after the withdrawal of French forces, which led an operation to oust Islamist militants from the north.
The assault is believed to have happened on Thursday in the northern city of Gao.
Medical help Gao was among the areas seized by militants following a coup in March 2012.
The woman is thought to have come forward seeking medical help from the UN immediately after the attack. This triggered the UN force to launch an investigation.
The BBC's Alex Duval Smith in Bamako says it is not known exactly how many Chadians were involved, but the victim identified four soldiers as having assaulted her.
At the time, 165 Chadian soldiers were stationed in Gao, our correspondent adds. They had defied the orders of their superiors and left their base in Tessalit after a dispute over pay and conditions.
A Minusma spokesman in Bamako said it was for the Chadian army to decide on what disciplinary action they should take against the men.
He said the victim would be offered medical, psychological and legal support but not financial compensation.
The Chadians are part of a force of 6,000 African troops serving under the 12,000-strong Minusma peacekeeping force.
French and West African troops drove militant Islamists out of northern Mali in February.
SOURCE: BBC
