Australian police have reportedly carried out a raid on at least two properties in Sydney this morning as part of a terrorism investigation.
One of the raid's targets, a 15-year-old, has been arrested and is facing questions from police, the Guardian Australia reports.
The arrest relates to "events that took place when the teenager was 13".
The Guardian says a second man has been arrested, and another young man is having his house searched but has not been arrested.
It is understood police will reveal more information to media later today.