The emergency services were spotted in East Street, near Kamsons Pharmacy, at around 10pm.
A photographer sent this newspaper pictures from the scene that show a damaged motorbike, a cordoned off area, an air ambulance helicopter, police cars, an ambulance car and vehicle debris in the road.
Sussex Police have been approached for comment and this story will be updated as more information comes in.
1. Littlehampton
Sussex Police and an air ambulance helicopter were seen at an incident in Littlehampton last night (Saturday, August 12) Photo: Sussex News and Pictures
2. Littlehampton
Sussex Police and an air ambulance helicopter were seen at an incident in Littlehampton last night (Saturday, August 12) Photo: Sussex News and Pictures
3. Littlehampton
Sussex Police and an air ambulance helicopter were seen at an incident in Littlehampton last night (Saturday, August 12) Photo: Sussex News and Pictures
4. Littlehampton
Sussex Police and an air ambulance helicopter were seen at an incident in Littlehampton last night (Saturday, August 12) Photo: Sussex News and Pictures