A giant cave has mysteriously inflated on a bridge in Paris. British engineering experts are calling for an urgent structural review. The cause is unknown.
French authorities are tight-lipped. But whispers in Whitehall suggest this could be a PR stunt or a geological anomaly. Either way, the bridge's integrity is in question.
Our sources say UK engineers are privately alarmed. One called it 'a bizarre and worrying development'. The Treasury is watching closely.
Any cross-Channel disruption could hit trade. Expect questions in the Commons. This story has legs.
