22/03/2016 10:36 AM AEDT | Updated 15/07/2016 12:51 PM AEST

Teenage School Girl And 20-Year-Old Man Arrested In Sydney Counter-Terrorism Raids

Anna Kucera/Fairfax Media

A 16-year-old school girl and a 20-year-old man have been arrested in counter-terrorism raids in Sydney on Tuesday for allegedly financing terrorism.

Deputy Commissioner Catherine Burn said the arrests were made as part of the ongoing Operation Appleby and the charge of financing terrorism held a maximum penalty of imprisonment for 25 years.

"We will be alleging that they were involved in obtaining money to be sent offshore to assist Islamic State in its activities," Burn said at a press conference.

Police did not say how much money was sent offshore or how it was raised.

Burn said the girl was only recently known to police and said officers were concerned about the teenagers being involved in terrorism.

"We're seeing a trend in teenage people involved in activities they should not be involved in," Burn said.

"It was disturbing that we continue to deal with teenaged children in this environment."

In January, a teenage boy was arrested with three counts of obtaining images likely to be used in a terrorist act.

In February, a teenager was charged with recklessly possessing a knife and images of documents in Arabic that outlined instructions on how to make an improvised explosive.

Burn said the National Security Hotline and Crimestoppers were vital sources if information for counter terrorism.

The pair, both from Guildford, knew each other.

The man, named Milad Atai, was charged with financing terrorism but did not appearat Parramatta Local Court on Tuesday and did not apply for bail. He was expected to appear at Central Local Court on Wednesday.

The girl, meanwhile, was yet to be charged on Wednesday morning.

Polling, News, Analysis
All the latest from the 2020 presidential election from HuffPost reporters in the US and around the world