The Barcelona terror attack is sending several U.S.-based travel, hotel and leisure stocks lower on Friday. 

The Dow Jones U.S. Travel & Leisure Index was down another 0.2% Friday morning. It's been falling since the attack and has lost more than 1.2% this week. Hotel stocks were taking a hit Friday morning as well, with shares of Marriott International Inc (MAR) , Hilton Worldwide Holdings Inc (HLT) , and Hyatt Hotels Corp.  (H) all moving lower.

Popular travel booking companies were also in the red on Friday including Priceline Group Inc (PCLN) , Tripadvisor Inc (TRIP) and Expedia Inc (EXPE) .

But despite the bearish sentiment regarding the travel and leisure sector, U.S.-based airlines have been resilient. Shares of international U.S.-based carriers including United Continental Holdings Inc (UAL)  and Delta Air Lines, Inc. (DAL) were climbing higher Friday morning.

On Thursday, a van sped down Las Ramblas in the Barcelona, striking and killing at least 14 people and injuring over 100 more. Police later confirmed it was a terrorist attack, and ISIS has claimed responsibility.

The attack sent an immediate shock through European airline and hotel stocks, sending the Euro Stoxx 600 Travel & Leisure index more than 1% lower. The index had previously risen by more than 4.7% year to date.  During European trading, airlines including low-cost carrier Ryanair (RYAAY) and hotels like InterContinental Hotels (IHG) were sent lower over 4% and 1.6%, respectively.

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