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Activist investor Carl Icahn continues to think bad things lie ahead, even though his last prediction of doom failed to materialize so far.

Icahn repeated his prediction of problems ahead, telling a crowd at the annual DealBook conference Tuesday that he agrees with hedge fund titan Stanley Druckenmiller, who spoke before Icahn and said Federal Reserve policies are going to cause woes for the market.

"There are going to be real problems. We're walking into a minefield of what's going on with the Fed," Icahn said. "I could go on and on here, but I think we have problems."