Iran vows to avenge killing of Hamas political leader Haniyeh

The Palestinian militant group, Hamas, says its political leader, Ismail Haniyeh, has been killed in Iran. Will this lead to a regional escalation?Also on the programme: Costa Rica has said it is prepared to offer the Venezuelan opposition leader, Maria Corina Machado, asylum after reports the government in Caracas had issued an arrest warrant for her; and Australia starts the world-first peanut allergy treatment for babies. (Photo: Palestinian group Hamas' top leader, Ismail Haniyeh, pictured in March. Credit: Reuters)