An American Airlines flight with 145 people on board made an emergency landing Tuesday in Iceland after five crew members became ill following reports of chemical fumes in the cabin.

American Airlines Flight 49 traveling from Paris to Dallas-Ft. Worth landed safely just after 1345 GMT (9:45 a.m. EDT). The source of the fumes was being investigated, Keflavik Airport spokesman Fridthor Eydal said.

“They were apparently having some sort of problems with some sort of fumes in the cabin,” said spokesman Tim Smith for American Airlines, a unit of AMR Corp.

Smith said maintenance people in Iceland would try find out what happened, and that the backup plan was to send another plane from London to pick up the 133 passengers and 12 member crew.

The five crew members were in the cooking area of the Boeing 767-300 when they became ill, Civil Protection Agency officials said in a statement. Eight ambulances and health department were sent to the airport.