In a statement, the federal public prosecutor's office said over 100 federal and cantonal police officers were involved in Wednesday's police operation, which formed part of an investigation against a Swiss-Turkish dual national and a Turk suspected of supporting terror groups. They may have helped recruit other people to Isis or related groups, said the prosecutor's office.
During the course of Wednesday's operation police carried out various searches in Ticino, resulting in one arrest.
Speaking to news agency ATS, the public prosecutor's office confirmed that the arrested person was indeed one of the two subjects of the criminal investigation, but did not give further details.
An unspecified place of prayer in the Lugano region was also searched, but no one was arrested there.
According to ATS Ticino cantonal police are conducting a parallel investigation into the Swiss-Turkish suspect's boss, the owner of a surveillance firm that had connections to a centre for asylum seekers in Camorino.
He was also arrested on Wednesday.
Ticino police suspect both men of breaking employment laws and violence against at least one asylum seeker, said ATS.