Protesters have gathered outside a police station in north-west London following the arrest of teenage boy.
About 40 people assembled outside of Colindale Police Station in Barnet.
It comes after a 14-year-old was arrested on suspicion of possession of cannabis earlier. Police said they had been obstructed from making the arrest.
A dispersal order was issued and a cordon was placed around the station. The boy has since been released under investigation with his mother present.
A 19-year-old was also arrested for allegedly assaulting an officer.
A number of officers suffered minor injuries but did not require treatment and more officers arrived to support the dispersal of the group, the Met Police said.
In a statement Scotland Yard said: “We have not received any reports that members of the public or those under arrest sustained any injuries.”
Officers arrested the 14-year-old near Grahame Park at about 14:40 BST.
As they were doing so, a group began to gather around officers and “obstructed the police vehicle from leaving the scene”, the Met said.
Two men, aged 23 and 25, were arrested on suspicion of obstruction of a police constable.
The police vehicle left the scene and a group of 30 to 40 followed on foot to the police station, the Met added.
MPS Barnet tweeted at 21:03 that the teenager “has now been released under investigation from police custody with his mother present”.
The other people arrested remain in police custody.