Searches were carried out inside the home and in the property's front and backyards and several items were seized.

The operation was connected with the recent spate of racist graffiti, with slogans including "refugees die" and "racial war" daubed on a synagogue, a police station, a pharmacy and a block of flats in Perth.

A spokesman for WA Police's Gang Response Unit, which carried out this morning's raid, said it was part of Operation Atlantic, the investigation launched into the graffiti attacks.

"We are searching the house to look for material that corroborates information we already have," the police spokesman said.

Mr van Tongeren was not in the house at time of the raid, the spokesman said.

Five men have been already charged over the graffiti attacks, with police saying there were links between some of the men and extreme right-wing Australian Nationalist Movement (ANM), headed by Mr van Tongeren.

Posters promoting the ANM were found close to the graffiti.

Following the graffiti, of which Mr van Tongeren has denied knowledge, senior police said he was "almost certainly" a person of interest with regard to the attacks, and would be spoken to by police.

Damon Paul Blaxall, 28, Shannon Mark Post, 24, Daniel Tyrone Klavins, 26, Frank James Lemin, 20, and Benjamin Weerheym, 27, have already been charged with criminal damage in relation to the graffiti.

Mr Blaxall, who is presently undergoing psychiatric assessment, also faces a charge of racial vilification.

Mr van Tongeren served 12 years of an 18-year term for firebombing Chinese restaurants in Perth in the 1980s.