Summary of the latest developments
"¢ Free Syrian Army rebels have withdrawn from parts of Aleppo after intense bombardment. The Guardian's Martin Chulov says they have withdrawn all their main fighting units from the Salahedin district.
"¢ Former health minister Wael al-Halki has become Syria's third prime minister in four days. He replaces Omar Ghalawanji who was appointed as caretaker prime minister in the wake of Monday's defection of Riyad Hijab.
"¢ Egyptian Nobel laureate Mohamed ElBaradei is reported to have turned down an offer to replace Kofi Annan as international envoy on Syria.
"¢ In Lebanon, former MP and cabinet minister Michel Samaha – a prominent ally of the Syrian regime – has been arrested over a "sensitive" matter related to "security"
"¢ President Assad's chief of protocol has appeared in a video denying the FSA's claim earlier today that he had defected – though he said he had been in Lebanon receiving medical treatment.
"¢ Indiscriminate air strikes by a Czech-designed jet have been photographed and described in Tel Rifaat north of Aleppo. "Although the pilots seemed to know where the rebel bases were, their fire was often indiscriminate," a Reuters reporter said.
"¢ Syria's allies have been attending talks in Iran. Representatives from Russia and China are believed to be attending.
"¢ A senior figure in the Obama administration has refused to rule out imposing a no-fly zone over Syria. Speaking at the Council on Foreign Relations, John Brennan, Obama's senior counter-terrorism adviser, said: "I don't recall the president ever saying that anything is off the table."
Updated at 17:51 BST