WASHINGTON — The Consumer Financial Protection Bureau issued a warning to consumers Monday about the danger of digital currencies, sparking questions about whether the agency could soon seek to write new rules in that area.

The agency said currencies like Bitcoin and Dogecoin can have volatile exchange rates, unclear costs, and are vulnerable to hacking and scams. The agency simultaneously announced it is accepting complaints on virtual currencies, which is often used as the start to an enforcement investigation or research for rulemaking.

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