Heywood has been hit with a dispersal order after a group of youths were seen carrying knives on Sunday evening.
Police were called to a disturbance in the town centre on Sunday, February 13.
A large group of young people were spotted carrying various weapons, including knives.
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The Heywood neighbourhood policing team announced on Monday that a large dispersal notice would be issued.
They are now asking parents in the area: "Do you know where your child is?"
The order will remain in place until 2am on Thursday, February 16.
Police will have the powers to direct a person who has, or is likely to commit antisocial behaviour, to leave the area and not return for a period of up to 48 hours.
Police said the aim of the notice is "is to minimise behaviour contributing to, or likely to contribute to anti-social behaviour or crime or disorder in the area."
The large boundary includes areas such as Broadfield, Heady Hill and Hopwood.
An individual is guilty of an offence if they fail to comply with the Dispersal Notice.
And those who knowingly fail to comply could be arrested and may be liable to a fine of £2,500 and/or 3 months imprisonment.
