A British lawmaker who led a review last year of the detention of deposed Egyptian president Mohamed Morsi said Tuesday there should be an independent international probe into his death.

Thousands joined in prayer in Istanbul on Tuesday for former Egyptian president Mohammed Morsi who died a day earlier after collapsing during a Cairo court session.

Clashes between pro-government forces and jihadist-led groups that control Syria's northwest killed at least 45 combatants on Tuesday, a war monitor said.

Russia on Tuesday called for restraint to avoid escalation in the Middle East after the US said it was deploying additional troops due to heightened tensions with Iran.

Egypt's first democratically elected president Mohamed Morsi was buried Tuesday as calls mounted for an independent investigation into the causes of his death after he collapsed in a Cairo courtroom.

The Islamist leader, who was overthrown in 2013 after a year of divisive rule and later charged with espionage, was buried at a cemetery in eastern Cairo's Medinat Nasr, one of his lawyers said. 

Mohamed Morsi, who died Monday aged 67, was Egypt's first democratically elected president but spent just one turbulent year in office after the 2011 uprising before the army toppled him.

Turkish  President Recep Tayyip Erdogan on Monday blamed Egypt's "tyrants" for the death of former Egyptian president Mohammed Morsi who died in a Cairo hospital after fainting during a court session.

Former Egyptian president Mohamed Morsi died on Monday in a Cairo hospital after fainting during a session in court, judicial and security sources said.

Iraqi authorities have removed nearly 30 kilometres of concrete blast walls across Baghdad in the last six months, mostly around the capital's high-security Green Zone, a senior official told AFP. 

A car bombing near Kurdish security offices in northeast Syria on Monday wounded seven civilians, including a child, a war monitor said.

There was no immediate claim of responsibility for the attack near the local security forces headquarters in the Kurdish-majority city of Qamishli, the Britain-based Syrian Observatory for Human Rights said.