At least 50 civilians were killed and more than 500 arrested during a military operation conducted by Mali's army and "foreign troops" on April 19, the United Nations said in a report on Wednesday.

The incident took place on market day in Hombori municipality, in the central region of Douentza.

The victims included a woman and a child, the UN peacekeeping mission MINUSMA said in a quarterly report on human rights violations between April and June.

Mali's military spokesman did not immediately respond to a request for comment.

(With input from Reuters)