It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Some features of ATS will be disabled while you continue to use an ad-blocker.
'It's the Martians landing,' said one comment, while several others also suggested a spaceship had landed on Russia's second city and former Imperial capital.
Another commenter added: 'I know precisely what this is - tests of a neutron bomb in St Petersburg.'
The flash was the result of an explosion at an electrical power plant in St Petersburg, in what was described as a 'technical malfunction' by officials. No one was hurt in the incident.