The Islamic State jihadist group says it will start minting its own gold, silver and copper coins for use in areas under IS control in Syria and Iraq.
"God willing, coins of several types will be minted from gold, silver and copper," the IS said in a statement distributed on jihadist forums on Thursday.
The aim was to replace "the tyrannical currency system that was imposed on the Muslims, and which led to their oppression".
The IS group says its circulation of the new coins, to counter the widely-used US dollar, will free Muslims "from profiteering, satanical economic oppression", and posted pictures of what the coins will look like.
On one side, the words "Islamic State" and "a caliphate following the model of the Prophet (Mohammed)" are engraved, as well as the weight and value of the coin.
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On the other, various symbols are used.
The five-dinar gold coin shows a world map, while the Al-Aqsa mosque in Jerusalem is portrayed on the silver 10-dirham coin.
The crescent is embossed on one of the copper coins, while three palm trees are engraved on another.
Unlike the modern form of the dinar used today in some Muslim countries, the ancient dinars were made of pure gold and silver rather than less precious metals.
Experts say the IS is financed mainly through extortion of local populations in areas it controls, crude oil sales and ransoms for kidnappings.
It is unclear how much precious metals the group has amassed.
