You are an expert at summarizing long articles. Proceed to summarize the following text: 
the un 's world food programme has bought more than #,### tonnes -lrb- #,### us tons -rrb- of barley for sahrawi refugees living since #### near tindouf , south-west algeria , the food aid organization said in a statement sunday .
un buys more than #,### tonnes of barley for sahara refugees