Islamic State (IS) fighters are being smuggled into Europe by gangs in the Mediterranean, an adviser to the Libyan government has told the BBC.
Abdul Basit Haroun said smugglers were hiding IS militants on boats filled with migrants.
Officials in Italy and Egypt have previously warned that IS militants could reach Europe by migrant boat.
However, experts have cautioned that it is very difficult to verify or assess such claims.
Mr Haroun based his claim on conversations with smugglers in parts of North Africa controlled by the militants.
He alleged that IS was allowing the boat owners to continue their operations in exchange for half of their income.
About 60,000 people are estimated to have tried to cross the Mediterranean this year, fleeing conflict and poverty. Since the 2011 uprising, Libya has been without a stable government, and the chaos has allowed trafficking networks there to thrive.
Read more: BBC