AMMAN - Syrian tanks and artillery shelled the eastern city of Deir al-Zor on Monday, killing at least 20 people in the second day of heavy bombardment in the country's main oil-producing region, opposition activists said.

"Regime forces have dismantled their roadblocks from inside of Deir al-Zor after incurring heavy losses from rebels. They have withdrawn from residential areas and are now shelling the city from the outskirts. The victims are mostly civilians," a source at a hospital in Deir al-Zor told Reuters.

Syrian authorities have barred most independent media from the country, making difficult independent verification of events on the ground.

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