Officials say Turkish police have seized material allegedly used by Islamic State militants to produce coins for the group and arrested six foreign nationals.

A statement from a local governor's office said police had seized the coin-making equipment inside a building in Gaziantep city, near the border with Syria, as well as in the suspects' vehicles. It said the coins produced are used as currency in IS-controlled areas.

The statement, posted on the website of the Gaziantep governor's office Wednesday, didn't provide information on the suspects or say when they were arrested.

Officials from the governor's office couldn't be reached for comment on Thursday.

Turkey has been cracking down on IS activities in the country, detaining dozens of suspects and preventing militants from crossing into Syria.