WASHINGTON — Homeland Security Secretary John Kelly said Sunday he is considering banning laptops from the passenger cabins of all international flights to and from the United States.

That would expand a ban disclosed in March that affects about 50 flights per day from 10 cities, mostly in the Middle East. The current ban was put in place because of concerns about terrorist attacks.

The ban prevents travelers from bringing laptops, tablets, and certain other devices on board with them in their carry-on bags. All electronics bigger than a smartphone must be checked in.

Kelly was asked on ‘‘Fox News Sunday’’ whether he would expand the ban to cover laptops on all international flights into and out of the United States. His answer: ‘‘I might.’’

The current US ban applies to nonstop US-bound flights from 10 international airports in Amman, Jordan; Kuwait City; Cairo; Istanbul; Jeddah and Riyadh, Saudi Arabia; Casablanca, Morocco; Doha, Qatar; and Dubai and Abu Dhabi in the United Arab Emirates.

Earlier this month, there were reports that the Trump administration would broaden the ban to include planes from the European Union, affecting trans-Atlantic routes that carry up to 65 million people a year.

US officials have said that initial ban was not based on any specific threat but on longstanding concerns about extremists targeting jetliners.

‘‘There’s a real threat,’’ Kelly said, adding that terrorists are ‘‘obsessed’’ with the idea of downing a plane in flight, ‘‘particularly if it’s a US carrier, particularly if it’s full of mostly US folks. It’s real.’’

While Kelly referred to a threat, the Trump administration’s spending plan for the budget year that begins Oct. 1 would cut airport security programs.

Associated Press