After 2 pm, police were alerted to central Östermalm after at least one person was seen with a weapon.
The people who are said to have had the weapon left the scene in two cars.
The police searched for the vehicles and they were stopped shortly after 3 pm on the Klarastrandsleden and checked.
- It ends with all ten people being arrested.
The youngest is in his teens and the oldest in his 25s.
Young men of mixed ages, says Daniel Wikdahl, the police's spokesperson.
What kind of weapon it should be about more specifically is unclear.
A preliminary investigation into a serious gun crime has been initiated.