In the case of Syria, the investigation concerns assets presumed to belong to those close to Syrian President Bashar al-Assad deposited in banks in western Switzerland, the NZZ am Sonntag newspaper reported on Sunday.
It was unclear who and what sum of money was being investigated, nor whether accounts had been frozen, it said.
Questionable asset flows identified by Swiss authorities reached a record high of more than 3 billion Swiss francs ($3.21 billion) in 2011, lifted in part by wealthy North Africans who sought to move assets into the country as the Arab Spring raged.
Switzerland has frozen 50 million Swiss francs ($53 million) of funds belonging to Assad and other top officials. Last year, Swiss prosecutors froze roughly 3 million euros held in a Geneva bank by Hafez Makhlouf, a cousin of Assad, on grounds of suspected money-laundering.
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