The teenage wife of Sydney terrorism suspect Sameh Bayda has been charged with terrorism-related offences.

Key points: Alo-Bridget Namoa, 18, is the wife of Sydney terror suspect Sameh Bayda, also 18

Alo-Bridget Namoa, 18, is the wife of Sydney terror suspect Sameh Bayda, also 18 Police charge her with two terror-related offences

Police charge her with two terror-related offences There is no new, specific threat, police say

Alo-Bridget Namoa, 18, was arrested this morning in relation to an ongoing investigation into terror-related activities and was allegedly found in possession of a knife.

"We will be alleging that the item that she had possession of was a knife, and we will be alleging that the documents that we collected were related to the act also," Deputy Commissioner Catherine Burn said.

Police have charged the Auburn woman with recklessly possessing a "thing" connected to a terrorist act and recklessly collecting documents connected to a terrorist act.

Namoa has been denied bail and will appear at Fairfield Local Court tomorrow.

Deputy Commissioner Catherine Burn said the police were not dealing with any new specific threat.

"We are working around the clock," she said.

"We will be alleging that it is connected to a terrorist act and that will come out in court."

Sophie Toomey, Namoa's legal representative, said her family was devastated.

"They are shocked at the way things have transpired," Ms Toomey said.

"At this point they are rallying together and hoping to be able to see her in the next couple of days.

Alo-Bridget Namoa, 18, has been charged with terrorism-related offences. ( Supplied: Facebook )

"They're quite shocked, they're stunned, to them she's their 18-year-old daughter."

When asked to describe what the documents were, Deputy Commissioner Burn said she was limited in what she could say because she did not want to jeopardise the matters before the court.

"The investigation will continue and we will continue, as I say, to investigate any matter... that we come across that might be linked with terrorism," she said.

"We might not put the person before the court at the time, but if we are investigating such information and we believe that they are involved, persistence [by investigators] pays off."

Bayda, also 18, is being held in jail on three counts of collecting documents likely to facilitate terrorist acts.

Deputy Commissioner Burn praised the work of investigators and urged to public to continue to provide police with information.

"Today is another demonstration that we are not going to go away, that we continue, no matter what, and also I want to recognise the value of the community, all communities, and the information that we continue to get through the national security hotline or Crime Stoppers," she said.