Searches and seizures of materials belonging to the suspects took place on Tuesday at three apartments in Offenbach, according to the public prosecutor's office in Frankfurt am Main.

The men between the ages of 21 and 24 are alleged to have made preparations for an attack involving explosives or firearms.

According to the public prosecutor's office, a 24-year-old German of North Macedonian (formerly Macedonia) origin is the main suspect.

He had procured "basic components for the production of explosives" and searched the Internet for firearms, the authority announced.

Read more: The Local (Germany)