(BBC NEWS) The billionaire Sackler family "funnelled" at least $1bn (£800m) to different banks, including accounts in Switzerland, officials said.
The Sacklers own Purdue Pharma, which is accused of fuelling the US opioid crisis through drugs like OxyContin.
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Purdue is currently facing legal action brought by more than 2,000 plaintiffs, including almost two dozen US states.
Forbes estimates the Sacklers are worth $13bn, but many states claim the family has more money hidden abroad.