Would-be jihadists have been travelling on cruise ships to reach conflict areas in the Middle East, Interpol has warned.
The international police body said some of those trying to join militant groups in Iraq and Syria had used cruise lines to get to countries including Turkey.
It said checks to passenger lists should be extended from airlines to cruise companies before the issue becomes more of a problem, the BBC reported.
No figures were put on how many militants had travelled in this way.
But Interpol officials said militants’ use of cruise ships had emerged only in the “past three months or so”.
Interpol’s outgoing chief, Ronald Noble, said countries should conduct checks on all passengers using airports “and, more and more, cruise lines”.
Turkish authorities say they have deported hundreds of suspected foreign jihadists in recent months after detaining them at airports and bus stations.
Interpol director of counter-terrorism, Pierre St Hilaire, told the Associated Press news agency that this had led prospective fighters to make alternative travel arrangements in an effort to avoid detection.
“Because they know the airports are monitored more closely now, there’s a use of cruise ships to travel to those areas,” he said.
Regular stops at ports in the region would allow prospective fighters to disembark undetected and make their onward journey to Syria or Iraq untracked by security agencies, he claimed.
“There is evidence that the individuals, especially in Europe, are travelling mostly to [the Turkish coastal town of] Izmit and other places to engage in this type of activity,” St Hilaire was reported as saying.
A recent United Nations report estimated there were 15,000 foreign jihadists from more than 80 countries fighting with Islamic State (IS) and other extremist groups in Syria and Iraq.
“In order to prevent their travel and identify them, there needs to be greater information-sharing among the region, among national security agencies,” St Hilaire said.
Cruise industry body Clia said in response to the report: “Cruise lines work closely with authorities around the world and have stringent security processes designed to provide for the safety of passengers and crew.
“Passenger manifests are screened and systems are in place to confirm the identity of embarking and disembarking passengers.
“Cruise lines employ full-time security professionals, many of whom are former law enforcement officers, who are in regular contact with local and international authorities.”
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