Workers for Huhtamaki, which supplies the bowls for Chipotle's signature dish, protest for better working conditions, higher pay and the right to unionize.

McDonald's workers who are struggling to make ends meet have vowed to keep fighting for $15-an-hour pay and the right to form a union without retaliation.

McDonalds will raise pay for 90,000 of its US employees starting on 1 July but only employees working directly for McDonalds will qualify for the increase.

Amid declining sales and quirky promotions, the fast-food giant will test an all-day breakfast menu in San Diego in the coming months.