Spain's Interior Ministry says police have arrested two Moroccan brothers suspected of sending money to finance the armed Islamic State group.

A ministry statement said the two sent unspecified amounts of money to the Islamic State group's financial managers using false identities linked to the organization.

It said the group used the remittances to transport militants from different locations.

The ministry said the brothers, aged 33 and 22, were arrested Wednesday in the northeastern city of Girona.

It said a third brother had formed part of the cell but is believed to have died after travelling with his wife and two children to join IS in Syria.

Spanish police have arrested dozens of suspected pro-militants in recent years.