Iran's state-owned newspaper says authorities have detained three foreigners traveling through Iran under the suspicion of planning to join the extremists Islamic State group in neighboring Iraq.

Tuesday's report by the IRAN daily quoted Interior Minister Abdolreza Rahmani Fazli as saying Iranian border guards stopped several travelers en route to Iraq and had "three cases of arrests."

Fazli said Afghan and Pakistani nationals were arrested but did not provide a breakdown. The report did not say when or where the arrests happened.

The predominantly Shiite Iran supports the Iraqi government's struggle against Islamic State fighters who this summer overran much of western and northern Iraq, along with seizing territory in eastern Syria.

Tehran also provides military advisers to Baghdad in the anti-militant campaign against the mostly Sunni militants.