PARIS (AP) — France is increasing security on flights headed for the United States this summer amid U.S. concerns that al-Qaida is trying to develop a new kind of bomb.

The Obama administration this week called for tighter security measures at foreign airports that have direct flights to the U.S., prompting British airports to increase security Thursday.

The French civil aviation authority on Friday announced stepped-up security measures “for the summer period.” The agency said the measures might cause delays on U.S.-bound flights.

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