Spreading the area of air pressure over the jet staggers the sound waves and decreases the intensity of the boom.

CNN: Bang goes the sonic boom

Fire crews were called to the blaze on Skye at 17:10 BST on Friday and found it rapidly spreading over an area of grass and heathland due to the dry conditions.

BBC: Firefighters extinguish wildfires on Skye

Meanwhile, in Powys - where the largest concentration of cases exists in Wales - MAFF officials are to interview farmers under caution to discover how the disease has been spreading in the area.

BBC: Carwyn Jones, Welsh Rural Affairs Minister

This city of the Indus civilization was excavated in the 1920s and 1930s, spreading over an area of almost 600 acre and 10% of which has been excavated and was one of the most ancient planned cities in the world built entirely of fired brick in accordance to a carefully designed urban planning scheme.

UNESCO: Safeguarding Moenjodaro

He fears that the unacceptability of otherness is spreading in the Mediterranean area, threatening international co-operation, and that extremism is becoming a substitute for democratic values.

UNESCO: WHO IS THE OTHER?

Peel said the closure had been "a purely precautionary measure to prevent passing vessels spreading the oil into a wider area than that already affected".

BBC: Manchester Ship Canal closed after Stanlow oil spillage

We have fewer details about that at the moment, but there are also reports coming in that there may have been firing in another hotel in another part of the city, so we don't know if this is confined to the southern area of Mumbai, where I am, or if it's actually spreading out across the city.

CNN: Stevens: Mumbai put into lockdown as attacks continue

Area Commander George McGrandles praised the firefighters, saying their actions prevented the fire from spreading and damaging adjoining properties.

BBC: Scene of blaze at George bar in Paisley

Volunteers - many of whom were evacuated from their homes as the flames ravaged the area - will create ponds to form natural barriers to try to reduce the risk of fires spreading.

BBC: Burnt forest rises from the ashes