(Adds U.S. response, fresh Observatory quote)
BEIRUT, Sept 29 (Reuters) - U.S.-led air strikes hit grain silos and other targets in Islamic State-controlled territory in northern and eastern Syria overnight, killing civilians and militants, a group monitoring the war said on Monday.
The Britain-based Syrian Observatory for Human Rights said the strikes hit mills and grain storage areas in the northern Syrian town of Manbij, in an area controlled by Islamic State, killing at least two civilian workers.
Strikes on a building on a road leading out of the town also killed a number of Islamic State fighters, said Rami Abdulrahman, who runs the Observatory which gathers information from sources in Syria.
The U.S. military said on Monday an American air strike overnight targeted Islamic State vehicles in a staging area adjacent to a grain storage facility near Manbij, and added it had no evidence so far of civilian casualties.
“We are aware of media reports alleging civilian casualties, but have no evidence to corroborate these claims,” said Colonel Patrick Ryder, a spokesman at the U.S. military’s Central Command. He promised that the military would look into the report further, saying it took such matters seriously.
The United States has been bombing Islamic State and other groups in Syria for a week with the help of Arab allies, and hitting targets in neighbouring Iraq since last month. European countries have joined the campaign in Iraq but not in Syria.
The U.S. military said the facility targeted was used by the Islamic State as a logistics hub and vehicle staging area.
Manbij sits between Aleppo city in the west and the town of Kobani on the northern border with Turkey, which Islamic State has been trying to capture from Kurdish forces, forcing tens of thousands of Syrian Kurds to flee over the frontier.
Syria’s army also carried out air raids in Aleppo province overnight, targeting areas east of Aleppo city with barrel bombs and other projectiles, the Observatory said. The army also carried out air strikes in Hama in western Syria.
Forces loyal to President Bashar al-Assad have been battling Islamist fighters around Aleppo, which is held by a number of groups in Syria’s ferocious civil war.
In eastern Syria, U.S.-led forces bombed a gas plant controlled by the Islamic State outside Deir al-Zor city, wounding several of the militant group’s fighters, the Observatory said.
The United States has said it wants strikes to target oil facilities held by Islamic State to try to stem a source of revenues for the group.
The raid hit Kuniko gas plant, which feeds a power station in Homs that provides several provinces with electricity and powers oil field generators, the Observatory said.
U.S.-led warplanes also hit areas of Hasaka city in the north east and the outskirts of Raqqa city in the north, which is Islamic State’s stronghold. (Reporting by Sylvia Westall; Editing by Andrew Heavens and Crispian Balmer)