The Transportation Security Administration issued stricter screening requirements Monday for cargo loaded onto U.S.-bound flights leaving from seven airports from a handful of Middle Eastern countries due to concerns about terrorism.

TSA Administrator David Pekoske issued an emergency amendment requiring six airlines that fly to the U.S. from seven airports to undergo enhanced screening under the Air Cargo Advance Screening protocols. The countries where the airports are located are Egypt, Jordan, Qatar, Saudi Arabia, and the United Arab Emirates.

Turkey already participates in Air Cargo Advance Screening, which is typically voluntary.

“These countries were chosen because of a demonstrated intent by terrorist groups to attack aviation from them,” TSA said in a statement.

The six carriers that must adhere to the stricter security protocols for cargo will be required to submit air cargo data, such as the contents and names of the senders, in advance to U.S. Customs and Border Protection.

TSA expects about 250 flights per week to be affected by the new requirements.