The U.S. might add other airports to its ban restricting passengers from bringing laptops and other electronics into the cabin for certain flights from the Middle East.

“We may take measures in the not too distant future to expand the number of airports,” said Homeland Security secretary John Kelly on Wednesday during a congressional hearing.

Last month, the U.S. announced the , which affects ten airports, all of which are in Muslim-majority countries. Passengers flying to the U.S. are barred from bringing any electronic devices larger than a smartphone into a plane’s cabin, and must instead check them in as baggage.    

The U.S. declared the ban, citing terrorist threats. It has reportedly found that ISIS and other terrorist groups are ways to plant bombs in electronic devices that can bypass airport security.

with a similar ban. Canada is also studying whether to take action.

Critics have questioned why the ban only affects certain countries. However, security standards at airports can be inconsistent, said Jeffrey Price, a professor at Metropolitan State University of Denver, who studies aviation security.

that the ban will remain in place “until the threat changes.”

A more expanded ban might worry the PC industry. But companies involved such as Dell declined to speculate on its impact.   

PC maker HP said it was waiting to hear from the U.S. government to “understand the thinking and security underpinnings of these measures.”