A helicopter buzzes atop what activists say is the Syrian city of Aleppo.
Seconds later - an explosion rocks the country's commercial capital.
Nearby, smoke rises from another building - part of what Syrian rebels say is an intense bombing campaign by government forces.
The content of this video, obtained from a social media website, could not be independently verified by Reuters.
But it would appear to indicate an escalation of clashes in Aleppo - a key battleground in Syria's 17-month old rebellion.
The violence comes as Algerian diplomat Lakhdar Brahimi takes over a United Nations effort to bring peace to Syria.
Many Syrian refugees at this camp in Turkey, though, doubt he will make any headway.
"Lakhdar Brahimi or someone else - it's always the same," says this man. "The killings in Syria will continue."
More than 18,000 Syrians have died since fighitng errupted last year.
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