The inert relics, some as big as a grapefruit, were detected when agents X-rayed checked bags.

Federal agents are arresting spouses of Americans, tech workers and others whose visas have expired, including many who have active applications to stay in the country.

© Alicia Dantzker

The airports have opted in to the agency’s new security model, an agency spokesperson confirmed on Wednesday. A union official said the move could jeopardize public safety.

© Chris O'Meara/Associated Press