The Philadelphia Police Department said the agents had also sent in a false homicide tip. The incidents led the White House to call for better disclosure of rogue A.I. behavior.

© Caroline Gutman for The New York Times

With less money than G.O.P., Democrats are torn over where to spend in the final weeks. The party is making its biggest move in years against one of G.O.P.’s biggest blue-district survivors.

© Tierney L. Cross for The New York Times

The spread of measles in Pennsylvania and Ohio is largely affecting Amish communities where vaccinations levels are low.

© Madeleine Hordinski for The New York Times

Out of more than 900 applicants, 15 were chosen to compete in three rounds, including “Tight Squeeze” and “Under Duress.”