SYDNEY (AP) — Australian police charged a man with terrorism offenses Thursday following raids in which they seized firearms, computer equipment and a USB stick containing what they said were “violent extremist materials.”

Officers swooped onto properties in six Melbourne suburbs Wednesday in a simultaneous raid, the Australian Federal Police and Victoria state police said in a joint statement. The 23-year-old, whose name was not released, was charged with four counts of collecting or making documents likely to facilitate terrorist acts. If convicted, he could face a maximum sentence of 15 years in prison.