Wildfires in California threaten world's biggest tree – video

Firefighters have wrapped the base of the world's largest tree in a fire-resistant blanket as they tried to save a famous grove of gigantic old-growth sequoias from wildfires burning in California. The colossal General Sherman tree in Sequoia national park's giant forest is among the trees to be wrapped in aluminium as wildfires close in on the Giant Forest

• World's largest tree wrapped in fire-resistant blanket as California blaze creeps closer