Nairobi: More than 600,000 people in war-ravaged southern Somalia are suffering from severe malnutrition in a part of country that used to be considered its "bread basket", according to an aid agency report.

The Food Security Analysis Unit, which groups several relief agencies, published an assessment of nutrition in Somalia's Lower and Middle Shabelle region late on Monday.

"Nutrition ... has deteriorated dramatically since March in the ... region, [which is] generally the most resilient and the bread basket of the country," the report said.