A drone strike killed four people in regime-held eastern Syria on Wednesday in an area controlled by Iran-backed factions, a war monitor said. "Four people were killed and eight wounded in a drone strike near a weapons factory belonging to Iran-backed groups and near a truck loaded with weapons," Rami Abdel Rahman of the Syrian Observatory for Human Rights told AFP. There was no immediate word on who carried out the strike in the eastern city of Deir Ezzor or whether the dead were fighters or civilians. The strike targeted a part of the city that is home to residences of top Iranian commanders and senior officers of Lebanon's Hezbollah as well as an Iranian hospital to treat cholera patients, Abdel Rahman said. Pro-Iran factions aligned with the Syrian regime, including Hezbollah, are heavily deployed south and west of the Euphrates River which bisects Deir Ezzor province. Israel has carried out repeated air and missile strikes against government forces and their Iran-backed allies. A US-led coalition has also carried out strikes. State media said a landmine planted by "terrorists" exploded in the same neighborhood, causing casualties. "A number of citizens were killed and wounded when a landmine planted by terrorists exploded in the Al-Hamidiya neighborhood of Deir Ezzor," state news agency SANA reported. SANA published photographs of the aftermath of the blast which showed extensive damage to a building and a truck.