At least 75 people were killed and 140 others wounded in a suicide car bomb attack carried out by the Islamic State (IS) militants in Syria's eastern province of Deir al-Zour, a monitor group reported.The Syrian Observatory for Human Rights on Sunday said children were among those killed in the blast that took place Saturday evening on the eastern bank of the Euphrates River in Deir al-Zour, Xinhua news agency reported.The explosion rocked the Tujar or Merchants Street between the Conoco gas field and the Jafra energy plants in the eastern province of Deir al-Zour.The UK-based watchdog group said many people have fled toward the desert region following the explosions carried out by the IS group.The IS group is losing ground to the Syrian Army, which captured recently the entire capital city of Deir al-Zour.