A mob of up to 25 youths went on the rampage through the streets in Eastbourne at the weekend.
They damaged parked cars and wrecked an off-licence door.
Trouble flared in the Green Street area as Friday night rowdiness escalated into violence.
Fearful residents called the police after spotting the teenagers using abusive language and threatening behaviour between 9pm and 10.30pm.
A force spokesman said: "It started off as minor rowdiness but appears to have escalated."
The youths dispersed as soon as officers arrived.
Police have appealed for witnesses to contact them on 0845 6070999.
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