According to official information, around 200 people demonstrated in Henstedt-Ulzburg in Schleswig-Holstein against an event by the right-wing AfD.
On the sidelines of the rally on Saturday, a 19-year-old drove a silver-gray pick-up truck to several demo participants.
Two men and a 21-year-old woman were injured in the clash, a spokesman for the Kiel public prosecutor said.
The State Security Commissioner took over the investigation into the case.
The public prosecutor's office is currently investigating the teenage boy for dangerous bodily harm as a unit with dangerous interference in traffic.
According to the spokesman, he showed himself to be cooperative after his arrest, but he has not yet commented on the matter itself.
The driver has not yet appeared under criminal law.
According to the public prosecutor's office, the man's political views and any motive are still being determined.
The "Hamburger Abendblatt" reported on a "right wing", but there has not yet been any official confirmation of this.
Expert examines pick-up
According to the police, there had previously been a spontaneous demonstration of 50 to 60 supporters of the left-wing scene and physical attacks against visitors to the AfD event and police officers.
Outside the event area, "demonstrators of the right and left scene" clashed.
According to a police spokesman, the adolescent belonged to a group of four young men who said they came from the event to which AfD federal spokesman Jörg Meuthen had also traveled.
There are different versions of what happened next.
According to the police spokesman, the demonstrators said that the driver had approached the activists in order to injure them.
On the part of the group of young men, however, it was heard that they had been harassed and molested, two of them, including the 19-year-old, had reached the car and wanted to pick up the others with it.
According to the police and public prosecutor's office, the course of the collision must now be clarified.
None of the police officers who were deployed at the AfD event would have seen the incident themselves, said the police spokesman.
After the collision, however, officials brought the driver to the ground, restrained them and transported them to the police station.
The passenger was also taken.
After the collision, there were tumults, the police spokesman spoke of a charged mood.
One of the officers then shot his service weapon in the air, supposedly to calm the situation down.
The pick-up was secured, an expert should determine, among other things, the speed on impact and the distance covered.
In addition, according to the prosecutor, witnesses will be interviewed.
It is still unclear who the car is registered for.
Icon: The mirror
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