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The firm added the crash had caused "multiple explosions" on board and an unknown quantity of jet fuel to be released.

In the age of social media and endless football coverage, it is not often a player arrives at a club as a relatively unknown quantity.

But when he quit, that number jumped to 9%, reflecting the fact that Harris was an unknown quantity to many Americans.

While most analysts believe Beijing does not have a favourite in this race for the White House, many would agree that Kamala Harris is an unknown quantity to Chinese people and the country’s leaders.

Newcastle are still a bit of an unknown quantity for me because I can't say I've been particularly impressed by them so far.