U.S. officials have said they plan to bolster security at some airports in Europe and the Middle East with direct flights to the United States.
U.S. Homeland Security Secretary Jeh Johnson on July 2 announced unspecified steps that would be carried out in "the coming days," without saying which airports would be affected.
The announcement comes amid concern that terrorist organizations are developing new explosives to circumvent airport security, such as nonmetallic explosives being surgically implanted inside a traveler's body.
After an assessment of security threats, Johnson said he had directed the Transportation Security Administration "to implement enhanced security measures in the coming days at certain overseas airports with direct flights to the United States."
An official at the Department of Homeland Security, who spoke on condition of anonymity, said the airports were located in the Middle East and Europe.
Based on reporting by AP and AFP