There's pleas from the Security Intelligence Service to report threats to national security.

Their annual Insights report warns a small number of people subscribe to a range of violent extremist ideologies.

The report reveals it's increasingly assessing individuals supporting violence as having a mixed, unstable or unclear ideological outlook.

Director-General of Security Andrew Hampton says people mostly don't act.

But he warns sometimes they might.

"The key message we want to get across is - if, within your community or your family, you're concerned about someone because they may be engaging in extremist material, that you do raise that with us of the police." 

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