A DORSET road is closed both ways due to a “substantial” diesel spill following a crash.

The A31 near Sturminster Marshall is shut between the Roundhouse Roundabout and the Lake Gates Roundabout.

The spillage occurred after a two-vehicle crash in which of the vehicles collided with a tree.

Two people have been treated for injuries that are not believed to be serious. 

Dorset Police said it was called to the scene at 1.09pm. 

A spokesperson said: "Officers attended and two people were treated by the ambulance service for injuries that were not believed to be serious."

"Road closures have been put in place between the Roundhouse Roundabout and the Lake Gates Roundabout and the highways authority has been contacted in relation to fuel on the road."

Highways England said: "Emergency services including Dorset Police are in attendance. Highways England has resources deployed to assist with closures and clear up.

"Road users are advised to expect disruption and to allow extra journey time."

The following diversions are in place: 

Eastbound

Road users travelling eastbound are advised to follow the hollow black circle diversion symbol on road signs.

From the A31 eastbound, leave at the Roundhouse roundabout.

Use the 3rd exit and join the A350 (Poole Road) south.

Continue southbound until the A35 roundabout.

Take the first exit east on the A35 and continue to the A350.

At the next roundabout (Holes Bay North) take the second exit south on Hole Bay Road (A350).

At the next roundabout with the A349 turn left (first exit) on Broadstone Way.

Follow the road north to the A349 crossroad with Cabot Lane.

Turn right at the crossroads to continue on the A349.

At the next junction turn left to join the A349 north (Waterloo Road) towards Wimborne Minster.

Continue north until the roundabout with A31.

Take third exit and re-join the A31 eastbound.

Westbound

Road users travelling westbound are advised to follow the hollow black square diversion symbol on road signs.

From the A31 westbound, leave at Merely roundabout taking the first exit south on the A341 (signposted A349).

Continue south until the traffic light controlled crossroads with Cabot Lane and Hatch Pond Lane.

Turn right heading west on Cabot Lane and continue to the crossroads with Broadstone Way.

Turn left at the crossroad to continue south on the A349 (Broadstone Way).

At the next roundabout turn right heading north on the A350.

At the first roundabout take the first exit heading west on the A35.

Continue to the roundabout with the A350 and take the third exit heading north on the A350.

Continue north until the roundabout with A31.

Take the first exit west to re-join the A31.

More follows.