The UK on Tuesday joined the U.S. in banning passengers from carrying large electronic devices in the cabins of airplanes originating from certain Middle Eastern and North African countries. The UK directive bans electronic devices larger than a cell phone and applies to airplanes departing from Saudi Arabia, Turkey, Lebanon, Jordan, Tunisia and Egypt. It affects 14 airlines, including six based in the UK.

The U.S. ban, which came to light when Royal Jordanian Airlines on Monday sent a tweet outlining details of the ban, affects 10 airports located in eight countries. It takes effect on March 25.

British officials said the UK based its ban on the same intelligence cited by the U.S. Department of Homeland Security. It remains unclear when the UK directive takes effect.

U.S. officials cited unspecified threats gathered by new intelligence as the reason for its action.

“Although the U.S. has instituted robust aviation security measures since 9/11, our information indicates that terrorist groups’ efforts to execute an attack against the aviation sector are intensifying given that aviation attacks provide an opportunity to cause mass casualties and inflict significant economic damage, as well as generate overwhelming media coverage,” DHS said in a statement.

The department cited as examples of recent terrorist attacks on civil aviation an October 2015 incident in Egypt where attackers packed a soda can with explosives and one in Somalia, where terrorists detonated an explosives-laden laptop in February 2016.