The terrorist attacks in Paris, Brussels and Turkey over the last year haven’t dissuaded Americans from visiting Europe, but they appear to be having an effect on the cruise line industry.

Fewer Americans are signing up for Mediterranean cruises this year, according to executives at Norwegian Cruise Line Holdings and Royal Caribbean Cruises, indicating that the attacks by Islamic State jihadists are affecting the industry.

“Typically when these kind of events happen … what tends to happen is new bookings are harder to come by,” Norwegian’s president and CEO, Frank Del Rio, said during the company’s first-quarter earnings call Tuesday, according to the travel industry website Skift.

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