The air ambulance was at the scene of a motorbike and lorry crash in a rural road.
Emergency services were called to The Broyle in Ringmer near Lewes this afternoon after the two vehicles collided.
Live updates: Follow live on our traffic information page
Queues are building up either side of the incident, which is partially blocking the road outside the Caburn Enterprise Park.
The KSS Air Ambulance, which came from its base in Redhill, left the scene at around 6.10pm.
The Argus has approached the emergency services for comment.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here