Does Iran have nuclear weapons and what missiles do they have?

Iran has the biggest stockpile of ballistic missiles in the Middle East, according to the US Office of the Director of National Intelligence (Picture: Sepah News/AFP via Getty Images)

As the world reels from what Trump has called ‘major combat operations’ by the US military in Iran, we are faced with more questions than answers.

What kind of nuclear weapons do enemies Iran and Israel possess — and how many? Could the conflict trigger a wider regional conflict – or even World War III?