A brutal attack erupted on the streets of a quiet town when one man was stabbed and two more were injured.
Eyewitnesses reported seeing three members of the Vikings Motorcycle Club from Surrey injured after they were attacked in Findon Valley near Worthing.
Earlier, the Vikings rode through Brighton heading West.
They were attacked when they stopped in Findon on Saturday night after becoming separated from the rest of the group.
One man had serious stab wounds.
Sussex Police said seven men have been arrested in connection with the attack on the A24 at around 7.30 on Saturday evening.
Joanne Denise posted on Facebook: “Mike and I were out on bike and just came upon an incident in Findon valley as it happened, three unfortunate men on motorbikes were injured, in what appears to be an unprovoked attack.
“Saw cars and a van with people jumping in and driving off.
“We administered first aid to two of them until ambulance arrived (they seem like they’ll be fine, thank goodness) and Mike directed traffic until services arrived.
“Many amazing people helped.
“Please let police know if you saw anything.
“I have spoke to one of their wives on his phone and the men were riding down from Surrey with the Surrey Vikings whom we saw on front.”
A spokesman for Sussex Police said: “Officers arrived at the scene to find a man with stab wounds.
“Two other men had also been assaulted.
“Seven arrests have since been made, involving colleagues from both Thames Valley and Warwickshire police, after the suspects had left the scene prior to the arrival of emergency services.”
The seven men arrested remain in custody and enquiries are continuing.
Anyone with information relevant to the ongoing investigation, particularly dash cam footage, is asked to report online, or call 101, quoting Operation Sedgemore.
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