Iraq and oil major BP signed a deal to redevelop four Kirkuk oil and gas fields, Iraq's state news agency reported on Tuesday.

The deal marks a breakthrough for Iraq, where output has been constrained by years of war, corruption and sectarian tensions.

BP is expected to spend up to $25 billion over the lifetime of the project, a senior Iraqi oil official told Reuters in early February.

(Reporting by Jana Choukeir, Writing by Clauda Tanios, Editing by Louise Heavens)