The unit of the National Bureau of Investigation (NBI) in Oulu, northern Finland, carried out a pre-trial investigation into a case of supporting Al-Shabaab related terrorist activities and captured a middle-aged suspect, said the police.
The suspect was a Somali national who arrived in Finland in September last year, Xinhua reported.
Al-Shabaab is a militant group based in East Africa. According to the Finnish police, the organisation is known to collect funds in the Nordic countries for supporting its operations in Somalia.
In September 2014, four suspects with Somali background were charged in Finland on suspicion of collecting and sending thousands of euros to Al-Shabaab. One of them was also suspected of recruiting his brother and nephew to join the group.