A volunteer folds paper airplanes with a young boy inside the Expo Building in Portland, Maine. Hundreds of migrants, many from Africa, have arrived there this month, and the city has converted the building into an emergency shelter to house them.

A volunteer folds paper airplanes with a young boy inside the Expo Building in Portland, Maine. Hundreds of migrants, many from Africa, have arrived there this month, and the city has converted the building into an emergency shelter to house them.