A Muslim cleric speaks ahead of Friday Prayers at the Grand Mosque in Brussels | Philippe Huguen/AFP via Getty Images Radical Islam on rise in Belgian mosques Moderate Muslims ‘powerless’ to stop the spread of extremist ideology, Belgium’s threat assessment body warned.

An increasing number of mosques in Belgium preach a radical form of Islam, according to a new report by the country's coordination body for threat assessment OCAM, local media reported.

Imams who preach Wahhabism, the form of Sunni Islam promoted by Saudi Arabia, are increasingly common in mosques and Islamic centers in Brussels, Antwerp and Mechelen, according to the report.

The radical movement is also gaining traction thanks to dedicated television channels and online media, OCAM said.

While adherents of Wahhabi ideology are a minority among the country's Islamic community, OCAM warned the "moderate Islam" preached in most mosques is "powerless" against the spread of the more extreme ideology.