Not sure what took them so long, hundreds of Salafists spent two straight weekends rioting in early May in the city of Bonn.

BERLIN (AP) — German authorities launched a nationwide crackdown Thursday on an ultraconservative Islamic organization, raiding homes, meeting halls and mosques, while banning one related group and opening in an investigation of two others.

Interior Minister Hans-Peter Friedrich said he had banned the Salafist organization Millatu Ibrahim, saying it has been calling on Muslims to fight against Germany’s “constitutional order.”

The raids, conducted by 850 police officers in seven of Germany’s 16 states, focused on two other groups — DawaFFM and DWR — to determine whether evidence exists to ban them as well. DWR’s initials are the German abbreviation for “The True Religion.

Friedrich said a “comprehensive collection of evidence” had been seized — videos, laptops, cellphones and other items. “All these things will be evaluated over the coming days, and we will see to what extent the evidence is sufficient to ban the two organizations which are being investigated,” he said.

Friedrich said authorities believed there were preparations under way to replace the German constitutional state with Sharia law, and warned that anyone who does so can expect to face prosecution.

Among other things, Millatu Ibrahim taught followers to reject German law and follow Islamic Shariah law and that “the unbelievers are the enemy,” a German security official said on condition of anonymity because of the sensitivity of the issue.

Germany’s intelligence and security agencies have increasingly been monitoring the actions of the Salafists, who number some 4,000 in Germany, in recent months.

That monitoring was intensified in May, after street clashes between Salafists and the small far-right Pro NRW party in Bonn and Solingen, in western Germany.