Hampshire emergency services are dealing with a collision involving two cars eastbound on Picket Twenty.
Emegency services were called to the scene at 12.57 pm.
Two lanes on the A303 have been closed following the collision.
It appears a Volkswagen Golf has collided with a white van.
A separate incident that occurred at the same time on the A303, involved a Toyota Starlet and a Volvo V70. One incident happened near buck services and the other one near the BP garage.
The event is expected to clear between 2:45 pm and 3:00 pm.
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