Dozens dead in Russian, US bombing in oil-rich Syrian area

The victims were riding boats on the Euphrates River in Deir al-Zour, the watchdog said.
There was no immediate comment in Moscow.
On Tuesday, forces loyal to Syrian President Bashar al-Assad ended a nearly three-year Islamic State siege on the city of Deir al-Zour, the capital of the province of the same name.
On Saturday, a Syrian Kurd-led alliance, supported by the United States, started a separate offensive against Islamic State in Deir al-Zour.
Both sides have reported advances against Islamic State there.
Earlier Sunday, the Observatory reported that at least 23 people had been killed in aerial bombardment by a US-led alliance on a prison run by Islamic State in Dier al-Zour.
The attack took place on Saturday in the town of al-Bu Kamal near the Iraqi border.
The dead included 18 prisoners and five Islamic State militants.
At least 10 of the dead prisoners were Iraqis, added the Britain-based Observatory added that relies on a network of activists inside Syria.
Most of the province of Deir al-Zour has been controlled by Islamic state since 2014.
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