The American Trade Representative's office said the country had failed to meet the requirements of the African Growth and Opportunity Act (Agoa) because it had acted unconstitutionally.

There were two military coups in Burkina Faso last year, sparked by the authorities' inability to control an intensifying Islamist insurgency.

Agoa gives sub-Saharan African countries duty-free access to the US as long as they meet certain eligibility requirements, including progress towards democracy.