An explosion has hit a gas pipeline in north-eastern Syria, although production has not been affected, residents and officials said.
The cause of the overnight blast, which took place in Deir al-Zour province, close to the Iraq border, is not known.
If confirmed as an attack, it would be the first targeting infrastructure since protests erupted in March.
Large protests against the rule of President Bashar al-Assad have taken place in the province.
"The explosion hit the gas pipeline last night in al-Tayyaneh, north-east of the town of Mayadin," said Rami Abdel Rahman, director of the London-based Syrian Observatory for Human Rights.
One prominent tribal leader told Reuters that people suspected the regime was responsible, intending to discredit the democracy cause.
The pro-government al-Ikhbariya television station said there were no casualties from the blast, which caused only "limited damage" to the pipeline.
Syrian official sources have confirmed that there's been a fire at a pipeline, but did not say what the cause was. They said it was now under control and production had been unaffected.
The east of the country accounts for all Syria's 380,000 barrels per day of oil output and is among the poorest regions, with little investment from oil revenues.