Iran vows to 'respond' to killing of nuclear programme scientist – video

Iran's president, Hassan Rouhani, has said the country will respond to the killing of one of the country's most senior scientists, who was identified by Israel as having headed a secret nuclear weapons programme.

Mohsen Fakhrizadeh, the architect of Tehran's nuclear strategy, was killed on Friday on a highway near the capital in a carefully planned assassination that has led to a serious escalation of tensions in the Middle East.

• Iran's supreme leader calls for 'definitive punishment' of scientist's killers