Videos taken by bystanders showed a funnel cloud sucking up water, then sand, and then small pieces of buildings.

The aerial bombardment has burst a main water pipeline, causing serious shortages of water in Aleppo, activists said.

The carnage even stretched into the country's south, where bombs stuck to two parked cars exploded in the city of Nasiriyah.

The APEC countries support Russia's efforts to improve its Siberian transportation routes, increasing cargo traffic, Putin said.