Syrian first responders and activists said Sunday that regime bombing of the last opposition stronghold in the country has killed at least 11 civilians, as the nearly four-month offensive shows no sign of abating. The Britain-based Syrian Observatory for Human Rights said six people were killed, including a child, in the bombing of the village of Urum al-Joz in southern Idlib province. The opposition-operated Shaam news agency said those killed had been displaced from the southern tip of the rebel stronghold. Rescue workers, known as Syrias Civil Defense or White Helmets, said three children and a woman were killed in Kfaruma, south of Urum al-Joz. A White Helmet volunteer was killed in the town of Khan Sheikhoun, the group says. The offensive began in late April, displacing more than 300,000 people.