Police in Helsinki are asking residents to skip the fare and call the cops if they spot an Uber driver within city limits.

Cops sent out a tweet Friday asking people to call emergency services (112 if you live in Finland, apparently) so authorities could have a chat with the enterprising driver. It’s illegal to operate a cab without a license, according to the Helsinki Sanomat (via Slashdot via Jack Baruth), and police are using citizen reports and even sting operations to crack down on the drivers.

It’s unclear if police are arresting or fining the Uber drivers.

Uber lists Helsinki as one of the cities it currently services, despite the crackdown by authorities.

When Uber launched in Finland last year, officials praised the company and its services.

“Uber is a good example of what digitization can offer. It creates new possibilities,” Silja Ruokola, a senior government adviser at the Finnish Ministry of Transport and Communications, told the Helsinki Times in 2014.

Cabs in Finland are fairly expensive. On top of a €7 ($7.75) origination fee, riders pay €2 per kilometer. A typical 10 km cab ride would cost about €24 to €36 ($26 to $40 USD). A similar cab fare in Manhattan would cost roughly $25.