The southern city of Lahti reported a cyber attack on its information network systems on Tuesday afternoon.
Malware was detected on a single machine, from which it could have potentially spread to about a thousand workstations. Anti-virus software however prevented further infection.
"Malware has been detected," the city said in a Wednesday morning press release. "Anti-virus software has isolated the malware to a number of infected machines."
Health care customer service delays
The connection between the city of Lahti and the Päijät-Häme welfare group in southern Finland was cut off as soon as the intrusion was detected, to prevent the spread of malware. The disconnection may cause a delay in the provision of service to customers, the group warned.
"There are currently no known issues that directly endanger patient safety. We will continue to monitor the situation, and communicate further if the situation changes," Päijät-Häme said in a bulletin.
The closure of connections had also caused disruptions to the welfare group's human resources and financial systems.
The city of Lahti has filed a criminal report, and experts are currently investigating the origin of the attack in collaboration with police.