It sent two ambulances and one operations manager.
The Grassroots Trust Rescue Helicopter sent a helicopter but could not provide more information.
A local said on social media that they heard a “huge bang” followed by sirens.
Another wrote: “My first thought was, ‘Oh dear, that didn’t sound too good, I hope it wasn’t an accident’.”
Drivers were initially advised to use alternative routes and expect delays while the Serious Crash Unit investigated.