WHITE PLAINS - A new rule that will require some passengers to turn on their electronic devices before flying overseas into the U.S. is expanding to domestic flights.

Officials say it will affect a very limited number of passengers who already get enhanced screening because they're on watch lists.

If a passenger's electronics won't turn on, they'll have to leave them behind or not fly.

The measure is in response to concerns that terrorists are trying to figure out new ways to sneak explosives onto planes.