 They had been arrested because they had healed a slave girl who was demon-possessed and had the ability to tell fortunes. This aggravated Nero, her owner, who had been using her to acquire money. So he made some false claims against Paul and Silas and eventually had them arrested. Listen to Acts 16, 20-24. And then brought them to the magistrates and said, These men, being Jews, exceedingly trouble our city."