The son of a man arrested in Sydney over an alleged plot to bring down an aeroplane has been released without charge.
The 50 year old man, whose identity is yet to be confirmed was taken into police custody on Saturday after a joint counter-terrorism operation was investigating allegations of a proposed terrorist attack.
The Australian Federal Police and the NSW Police have confirmed that the man was released overnight without being charged with a criminal offence.
Three men remain in detention under “specified time” provisions outlined in the Crimes Act, after being arrested by the NSW Joint Counter Terrorism Team in a series of raids across the Sydney suburbs of Surry Hills, Wiley Park, Lakemba and Punchbowl.
The police have said that the investigation remains ongoing and further information will be provided “at an appropriate time.”