HELSINKI (AP) — Police say they suspect six people in Finland of being involved with the al-Qaida-linked Somali insurgent group al-Shabab through collecting funds, recruiting people to join the group and trafficking of minors for terrorist training in Africa.

Detective Chief Inspector Kaj-Erik Bjorkvist told the AP on Tuesday that the four men and two women, who live in Finland, are not under arrest but have been banned from leaving the country. He declined to give their nationalities.

Bjorkvist says the investigation is not linked to the weekend attack in Nairobi and has been going on for four years.

He says material collected by police indicates all six were involved with al-Shabab. Prosecutors are expected to decide on bringing charges in December.