The victims were aged 16, 17 and 20.
Anyonw with information on this incident is asked to contact Cumbernauld police on 101. Alternatively Crimestoppers can be called free and in confidence on 0800 555 111.
Banton Loch is scene of violence
Police are investigating an incident where three young men were attacked at Banton Loch on Saturday during a disturbance around 9pm.