Twitter users have posted pictures from Edinburgh Airport that appear to show the disturbance caused by its closure this afternoon, following the discovery of a "potentially suspicious" bag.
Bomb disposal experts have arrived at the airport to investigate the package.
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A rather cloudy start for most, with rain spreading eastwards, clearing to brighter skies later in the day.
The letter was signed by the CBI, British Chambers of Commerce, the EEF, the Institute of Directors and the Federation of Small Businesses.
A spokesperson said Rory Stewart's remarks were in line with the British government’s stated position.