A woman is due to face court after being charged by counter terrorism police over alleged threats sent via social media at the weekend.

Just after 1pm on Sunday officers from Sydney were contacted after a media organization received threatening messages through social media.

An investigation was subsequently launched by the High Risk Terrorist Offenders Unit.

A 26-year-old woman was arrested with the assistance of Lake Macquarie Police outside a unit complex at Mayfield about 11.10am on Monday. 

Investigators seized the woman’s mobile phone, which will undergo forensic examination, before she was taken to Waratah Police Station.

The Argenton woman was charged with use carriage service to menace/harass/offend and stalk/intimidate intend fear physical harm.

Police allege the woman sent messages to the media organisation via social media and made various threats over a story that had been broadcast.

She has been refused bail to appear at Newcastle Local Court on Tuesday. 

Anyone with information about extremist activity or possible threats to the community is being urged to contact the  National Security Hotline on 1800 123 400.