On Interpol general assembly meeting in Monaco outgoing chief Ronald Noble confirmed  that the newest trend for supporters of ISIS to get in Syria is by Cruise ships—which were, up until now, a fairly easy way of traveling undetected.

Turkey, with its long and often porous border with Syria, has been a major thoroughfare for many of the thousands of foreign fighters seeking to join extremists like the Islamic State group.

Interpol chief Ronald Noble confirmed that Turkey ports cities are destinations where supporters of ISIS leave the cruise ships and transfer to Turkey – Syria borer. He also refused to indicate how many people might be involved, but called on countries to step up screening at all transportation hubs.

Turkish authorities say they have set up teams to nab suspected foreign fighters in airports and bus stations, and have deported hundreds in recent months.

"Because they know the airports are monitored more closely now, there's a use of cruise ships to travel to those areas," he told the AP on Thursday. "There is evidence that the individuals, especially in Europe, are traveling mostly to Izmir and other places to engage in this type of activity," he said.

Interpol officials said, using cruise ships to get in Turkey and then in Syria undetected is relatively new trend within the past three months or so.

"Originally, our concern about people on cruise ships — dangerous people on cruise ships — really focused on the classic sort of rapist, burglar, or violent criminal," Noble said.

"But as we've gathered data, we've realized that there are more and more reports that people are using cruise ships in order to get to launch pads, if you will — sort of closer to the conflict zones — of Syria and Iraq."