Unidentified aircraft struck oil-rich areas in eastern Syria held by government and Iran-aligned groups on Saturday, an opposition war monitor said. The British-based Syrian Observatory for Human Rights said there were no casualties or material losses in the attack, the second within a week in the province of Deir az-Zour. At least five explosions were heard, according to the monitor, in the Hawijah Kateh area and a nearby bridge north of Deir a-Zour city. Syrian state media also reported the attack but gave no details. Deir az-Zour is a strategic province that borders Iraq and contains oil fi…