Riot police were called to south London after protesters tried to force their way into a town hall.
The Metropolitan Police said initially there was a small rally outside the building in Lewisham at about 1900 GMT, but it swelled to about 100 people.
Some of the protesters managed to enter the building and officers in riot gear were sent to disperse them.
It is understood several arrests were made. Police said the incident was now over.
Nearby streets, including the A205 South Circular Road, were cordoned off for about an hour on Monday evening, but have now reopened.
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