Scientists say that lightning strikes are becoming more of a threat due to climate change after three people were killed and another is in a critical condition after they were hit near the White House.
The two men and two women were struck by a bolt that hit the ground during a severe storm while they visited Washington DC's Lafayette Square, just north of the White House, last Thursday.
The lightning hit near a tree that stands yards away from the fence that surrounds the presidential residence and offices across from the square, which is often crowded with visitors, especially in the summer months.
