It is believed a British mother and her two children died in the attack, while her husband survived.
Extinction Rebellion protesters lay down underneath the blue whale skeleton in the Natural History Museum.
The fire on Marsden Moor is the second moorland blaze of the bank holiday weekend.
The race from Wiltshire to London is considered to be one of the world's toughest endurance challenges.
Conservative local associations are calling for Theresa May to resign over her handling of Brexit.