News desk :
Syrian militant group al-Nusra Front has denounced US-led air strikes and in an online statement, called on jihadists around the world to target Western and Arab countries involved.
It comes as the US and other nations widened air strikes against Islamic State (IS) fighters in Iraq and Syria.
A Syrian activist group said overnight strikes hit three local oilfields near the Syrian IS stronghold of Raqqa.
The group, the London-based Syrian Observatory for Human Rights, also said one civilian was killed in a strike on a plastics factory on the outskirts of Raqqa.
Previously, the Pentagon confirmed that jets hit Raqqa on Saturday as well as IS positions near the Turkish border.
Kurdish fighters have been defending the Kurdish town of Kobane on the Syrian side of the border since an IS advance sent about 140,000 civilians fleeing to Turkey.
The US-led coalition of about 40 countries, including Arab states, has vowed to destroy IS, which controls large parts of north-eastern Syria and northern Iraq.
Despite sharing radical Islamist beliefs, IS and al-Nusra Front have been rivals, recently clashing with each other in Syria.
Turkish soldier monitors Kurdish refugees near border town of Suruc. 26 Sept 2014 Fighting near Kobane has sent thousands of Syrian Kurds fleeing to the Turkish border
But on Sunday al-Nusra spokesman Abu Firas al-Suri threatened the coalition nations.
Reuters adds: The United States and Russia see Islamic State as a common enemy but are failing to overcome deep mutual distrust and agree on how to tackle the threat together, making any role for Moscow in the U.S.-led campaign unlikely, say U.S. officials.
Differences between the former Cold War foes are stark, say the officials. Moscow suspects Washington’s ulterior motive is removal of its ally, Syria’s President Bashar al-Assad. Washington refuses to consider working together as long as Moscow insists that U.S. strikes need Syrian and U.N. approval.
Diplomatic efforts, from high-level talks at the United Nations to informal contacts in Moscow, have failed to resolve those misgivings, which echo broader problems in U.S.-Russian relations, already at a post-Cold War low over the crisis in Ukraine, American officials say.
“The main obstacle to Russian participation is Moscow’s position that ‘this can only be taken with permission of the Syrian government or through the U.N.,’ which is not something we accept,” a senior U.S. administration official told Reuters on the condition of anonymity.
Russia’s absence from the anti-Islamic State coalition complicates Washington’s calculus, reducing the possibility of U.S. leverage over the flow of Russian arms into Damascus as the U.S.-led campaign moves forward with air strikes in Syria and arms anti-Assad rebels.
Moscow, which has been trying to raise its diplomatic and economic influence in the Middle East, has been a major provider of weapons to Syria, giving Assad crucial support during the nearly four-year civil war and blocking wider Western attempts to punish him with sanctions for the use of force against civilians.
Washington, meanwhile, backs Syrian rebels who are seeking to topple Assad and are likely to play a central role in any future ground campaign inside Syria.
At a news conference at the United Nations on Friday, Lavrov questioned the legality of the air campaign and also gave the United States a “we-told-you-so” message about the consequences of U.S. policy in the region.
“We are fighting against terrorism consistently, constantly, not just when someone announces a coalition,” Lavrov said.
Moscow had long warned of the potential blowback of U.S. support for the anti-Assad opposition in Syria’s civil war. Plans to expand American training and arming of moderate rebels have only heightened those concerns.
