Protesters invaded the circuit during the start of the British Grand Prix at Silverstone.
A group of people, wearing T-shirts protesting against global oil usage, walked on to the Wellington straight as cars passed at low speeds, before being removed by police.
The race had been red flagged following a large crash on the opening lap.
Racing, which had started at 15:00 BST, resumed under an hour later.
“We can confirm that after the red flag, several people attempted to enter the track,” Formula One said in a statement.
“These people were immediately removed and the matter is now being dealt with by the local authorities.”
Northamptonshire Police later said seven people had been arrested.
On Friday, police had said they had “received credible intelligence” that a group of protestors were planning to disrupt the event and “possibly invade the track on race day” and had appealed to the group not to carry out the protest.
On Sunday, Chief Inspector Tom Thompson said: “I’m really disappointed that this group of people ignored our warnings prior to race day and made the incredibly dangerous decision to enter the track.
“We offered to facilitate a peaceful event at the circuit but they instead chose to put the lives of the drivers, marshals and volunteers at risk. It is incredibly disappointing that anyone would make the decision to do this.
“Thankfully, we had plans in place for an eventuality such as this and the group were swiftly removed and arrested by our officers.
“All seven are currently in custody where their details are being ascertained.”
