Middle East expert and Cambridge lecturer Roxane Farmanfarmaian, shares her thoughts on the killing of Hamas political leader Ismail Haniyeh whose death in an air strike in Tehran on Wednesday 31 July has been blamed on Israel. "This is an escalation, no question. And I think there will be some kind of retaliation and then there is also again the issue of this leader in Hezbollah that has seen an attack against Lebanon, right in Beirut," she says. IMAGES AND SOUNDBITES