A 'warning raid' by the US-led coalition on Thursday sought to prevent an attempted advance towards Tanf base in southern Syria, said a commander in the alliance fighting in support of Syrian President Bashar al-Assad. 'The raid only destroyed a tank. It did not aim to cause casualties or damage, but to stop an attack' and advance by Syrian government forces and allied militia, said the non-Syrian commander. The US-led coalition said it had struck pro-Syrian government forces that were 'advancing well inside an established de-confliction zone' northwest of Tanf base, where US special forces operate and train Free Syrian Army rebels.