RECEP Tayyip Erdogan Turkey’s president has accused Egyptian authorities of murdering former president Mohamed Morsi, who died on Monday after collapsing in court and vowed to see them prosecuted in an international court.

Erdogan at an election rally in Istanbul, said Morsi “did not die, he was murdered” and called on the Organisation of Islamic Cooperation (OIC) to act on his death.

Morsi, who was reported to have been suffering from diabetes, hypertension and liver disease, collapsed after speaking during a retrial hearing in Cairo over charges of collaborating with foreign powers and militant groups.

“Unfortunately, Mohamed Morsi was on the ground of the courtroom flailing for 20 minutes. No official there intervened. Morsi did not die naturally, he was killed.”

Friends and colleagues of Morsi have accused security forces of murdering the former president and claimed that police failed to administer first aid fast enough when he collapsed.

It was alleged that prison guards left the 67-year-old “slumped on the floor” in the courtroom for more than 20 minutes, despite other defendants calling for help.

United Nations’ spokesperson Rupert Colville has called for a “prompt, impartial, thorough and transparent investigation” into Morsi’s death and his detention conditions.

In response, Egypt accused Mr Colville of making “politicised and immature” remarks while the office of Egypt’s attorney-general has denied claims that he was murdered and argued he “was transported immediately to the hospital”, where he was later pronounced dead.

However, a group of British MPs and lawyers had warned that Morsi could die in prison if he did not receive urgent medical care in 2018.

Morsi, who was Egypt’s first democratically elected president, was buried quietly in Nasr City, an eastern suburb of the capital, on Tuesday.