Damascus, Nov 20 (Reporter) U.S. airstrikes killed five members of Iran-backed militias and wounded several others in eastern Syria on Tuesday, according to the Syrian Observatory for Human Rights. The Britain-based monitoring group reported that U.S. warplanes targeted military gatherings in the Al-Quriyah desert of Deir ez-Zor province. It said the strikes came after a rocket believed to be fired by pro-Iran militiamen landed near a U.S. base in the countryside of al-Hasakah province in northeastern Syria. Meanwhile, intermittent explosions of unknown origin were heard at a U.S. military base inside the al-Omar oil field base in Deir ez-Zor, the observatory said. U.S. fighter jets were seen flying over several villages, reaching as far as the town of Mayadeen in Deir ez-Zor's countryside near the Iraqi border, according to the observatory. There were no immediate reports of additional casualties. The region has seen increased tensions between U.S. forces and Iran-backed groups, which have a significant presence in eastern Syria...////...