U.S. security officials will require more screening of powdered substances in carry-on bags on international flights headed to the United States starting June 30.

A Transportation Security Administration spokesman said Wednesday that the change applies to more than 350 milliliters of powder, about the same as a soda can.

Passengers carrying larger amounts of powders including food, ground coffee or cosmetics could have their bags opened and the powder subjected to a test for explosives. TSA says it already requires the extra screening before domestic flights.

American Airlines is telling international passengers who have more than a soda-can amount of powder to put it in checked baggage, which undergoes more sophisticated scanning to detect explosives. TSA wants to expand CT technology to airport security checkpoints where carry-on bags are screened.

(AP)