Rising food prices could spark worldwide unrest and threaten political stability, the UN’s top humanitarian official warned yesterday after two days of rioting in Egypt over the doubling of prices of basic foods in a year and protests in other parts of the world.

As well as this week’s violence in Egypt, the rising cost and scarcity of food has been blamed for:

· Riots in Haiti last week that killed four people

· Violent protests in Ivory Coast

· Price riots in Cameroon in February that left 40 people dead

· Heated demonstrations in Mauritania, Mozambique and Senegal

· Protests in Uzbekistan, Yemen, Bolivia and Indonesia

UN staff in Jordan also went on strike for a day this week to demand a pay rise in the face of a 50% hike in prices, while Asian countries such as Cambodia, China, Vietnam, India and Pakistan have curbed rice exports to ensure supplies for their own residents