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Lt-Gen Atta said "retaliatory action" would be taken against the UAE, South Sudan and Chad's President Mahamat Déby.

"We know what we are saying, and our words are not a joke at all, nor are they spoken lightly," Lt-Gen Atta warned.

Iman Atta, the charity's director, called for coordinated action by the government and said: "As anti-Muslim hate continues to be felt by a greater number of British Muslims, both at a street and online level, our work and support for victims of anti-Muslim hate is needed now more than ever."

In 13 years, Mahama worked his way up to become vice-president, second-in-command under President John Atta Mills.

But in neighbouring Zambia, where two presidents have died in office, and in Ghana, where then President John Atta Mills died in 2012, the constitutional processes worked smoothly.